{"title":"Inline Check Valves","description":"\u003cp\u003eInline check valves put the check mechanism inside a compact body that threads or glues directly into the line. Apex Flow Solutions carries them in brass, cast bronze, 304 and 316 stainless steel and PVC, with threaded and socket ends. Match the size, thread and seal material to the valve you are replacing.\u003c\/p\u003e\n\u003ch2\u003eInline and spring check valves\u003c\/h2\u003e\n\u003cp\u003eInline check valves are usually spring-loaded. Our Spring Check Valves collection groups other spring-loaded models by closing mechanism, and three PVC models appear in both collections. Shop here when you are matching a compact body by size and connection.\u003c\/p\u003e\n\n\u003ch2\u003eHow an inline check valve works\u003c\/h2\u003e\n\u003cp\u003eForward flow lifts a poppet or disc off its seat. When forward pressure drops, the spring closes it against the seat. The pressure needed to open the valve, the cracking pressure, differs by model; ask us for the cracking pressure of a specific valve.\u003c\/p\u003e\n\n\u003ch2\u003eBodies, seals and connections\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBody\u003c\/th\u003e\n\u003cth\u003eEnd connections\u003c\/th\u003e\n\u003cth\u003eSeal\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003ctd\u003eFemale NPT\u003c\/td\u003e\n\u003ctd\u003eBuna-N or Viton on most models, by part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCast bronze (Midland 947140, 947143, 947144, 947145)\u003c\/td\u003e\n\u003ctd\u003eFemale NPT\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e316 stainless steel\u003c\/td\u003e\n\u003ctd\u003eFemale NPT\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e304 stainless steel (Midland 949430)\u003c\/td\u003e\n\u003ctd\u003eFemale NPT\u003c\/td\u003e\n\u003ctd\u003eFluoroelastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003ctd\u003eFemale NPT or socket (glue)\u003c\/td\u003e\n\u003ctd\u003eNot listed by Midland; ask us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure which seal your existing valve uses? Ask us with the part number.\u003c\/p\u003e\n\n\u003ch2\u003eCommon questions\u003c\/h2\u003e\n\u003ch3\u003eWhich way does an inline check valve install?\u003c\/h3\u003e\n\u003cp\u003eWith the flow arrow on the body pointing downstream. Follow the manufacturer's installation instructions for the specific model.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a brass inline check valve with stainless steel?\u003c\/h3\u003e\n\u003cp\u003eMatch the size, thread and seal first. If service conditions matter for your choice, \u003ca href=\"\/pages\/request-a-quote\"\u003esend us the details\u003c\/a\u003e and we will help match the valve.\u003c\/p\u003e\n\u003ch3\u003eDo you carry inline check valves with Viton seals?\u003c\/h3\u003e\n\u003cp\u003eYes. Use the Viton seal filter above, or ask us for a specific part number.\u003c\/p\u003e\n","products":[{"product_id":"12-glue-inlne-plastic-ck-vlv-940325","title":"1\/2 in. Glue Inline Plastic Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1\/2 in. Glue Inline Plastic Check Valve\u003c\/strong\u003e (#940325) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Socket (glue) ends integrate directly into standard PVC piping systems without additional adapters.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eSocket (solvent weld)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940325\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eSocket (solvent weld) connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260288215,"sku":"940325","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940325_d6b495b5-8f20-435f-a605-cd5ad1ba0787.jpg?v=1778884422"},{"product_id":"12-inline-fxf-pvc-spring-load-chk-vlv-940331","title":"1\/2 in. Inline Female x Female PVC Spring-Loaded Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1\/2 in. Inline Female x Female PVC Spring-Loaded Check Valve\u003c\/strong\u003e (#940331) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Female NPT connections allow direct threaded installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940331\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eFemale NPT threaded connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260320983,"sku":"940331","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940331_7f3246bc-0474-4582-b829-d82dc78ab76d.jpg?v=1778884423"},{"product_id":"34-fxf-pvc-inline-chk-vlv-spring-loaded-940332","title":"3\/4 in. Female x Female PVC Inline Spring-Loaded Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e3\/4 in. Female x Female PVC Inline Spring-Loaded Check Valve\u003c\/strong\u003e (#940332) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Female NPT connections allow direct threaded installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940332\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eFemale NPT threaded connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260353751,"sku":"940332","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940332_1322900e-6329-40b9-a78c-f7bf573ce835.jpg?v=1778884424"},{"product_id":"34-glue-inlne-plastic-ck-vlv-940326","title":"3\/4 in. Glue Inline Plastic Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e3\/4 in. Glue Inline Plastic Check Valve\u003c\/strong\u003e (#940326) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Socket (glue) ends integrate directly into standard PVC piping systems without additional adapters.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eSocket (solvent weld)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940326\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eSocket (solvent weld) connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260386519,"sku":"940326","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940326_7ee2cdb6-9f90-49df-a23c-f6edee26d744.jpg?v=1778884425"},{"product_id":"1-14-inline-fxf-pvc-spring-load-chk-vlv-940334","title":"1-1\/4 in. Inline Female x Female PVC Spring-Loaded Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1-1\/4 in. Inline Female x Female PVC Spring-Loaded Check Valve\u003c\/strong\u003e (#940334) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Female NPT connections allow direct threaded installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940334\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eFemale NPT threaded connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260419287,"sku":"940334","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940334.jpg?v=1778884426"},{"product_id":"1-14-glue-inlne-plastic-ck-vlv-940328","title":"1-1\/4 in. Glue Inline Plastic Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1-1\/4 in. Glue Inline Plastic Check Valve\u003c\/strong\u003e (#940328) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Socket (glue) ends integrate directly into standard PVC piping systems without additional adapters.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eSocket (solvent weld)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940328\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eSocket (solvent weld) connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260452055,"sku":"940328","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940328_fb18e36e-31ff-4763-af64-94fe2e4ff229.jpg?v=1778884427"},{"product_id":"1-12-glue-inlne-plastic-ck-vlv-940329","title":"1-1\/2 in. Glue Inline Plastic Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1-1\/2 in. Glue Inline Plastic Check Valve\u003c\/strong\u003e (#940329) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Socket (glue) ends integrate directly into standard PVC piping systems without additional adapters.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eSocket (solvent weld)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940329\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eSocket (solvent weld) connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e — Spring, swing, ball check comparison\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629260484823,"sku":"940329","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940329_c8bff109-8c82-4771-90f6-2542231d7868.jpg?v=1778884428"},{"product_id":"18-in-line-check-valve-vert-or-horiz-947140","title":"1\/8 in. Inline Check Valve, Midland 947140","description":"\u003cp\u003eThe \u003cstrong\u003e1\/8 in. Inline Check Valve, Midland 947140\u003c\/strong\u003e is a spring-loaded inline check valve with a cast bronze body and female NPT threads on both ends. Midland lists a PTFE seal and a PTFE poppet.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e947140\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003eCast bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrim (Midland)\u003c\/td\u003e\n\u003ctd\u003eBrass plug, stainless steel spring, HNBR O-ring, C360 machined brass cap, PTFE poppet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd connections\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT), thread size 1\/8 - 27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure rating\u003c\/td\u003e\n\u003ctd\u003e250 psi (Midland product page)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort\u003c\/td\u003e\n\u003ctd\u003e1\/8 in. NPT unloader port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet-to-outlet length\u003c\/td\u003e\n\u003ctd\u003e1-3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead content\u003c\/td\u003e\n\u003ctd\u003eMidland lists this model as \"Contains Lead\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eValues are from Midland's product page for 947140. Ask us for any value not shown, including the temperature rating and installation position for your service.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eInstall with the flow arrow pointing downstream, and follow the manufacturer's installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262221527,"sku":"947140","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_947140_7d826c38-73c7-434d-91a5-96f207c5cda3.jpg?v=1778884478"},{"product_id":"14-brass-in-line-check-valve-944401","title":"1\/4 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 1\/4 in. brass inline check valve (part \u003cstrong\u003e944401\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1\/4 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Need a stainless body? See the \u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in. 316 SS inline check valve (949401)\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262287063,"sku":"944401","price":18.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944401_cc9505a2-e925-4e17-b472-218bb8ae0d76.jpg?v=1778884479"},{"product_id":"38-brass-in-line-valve-viton-944402v","title":"3\/8 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 3\/8 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944402V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/8 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/8 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in. Buna-N version (944402)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in. 316 SS inline check valve (949402)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262418135,"sku":"944402V","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944402V_178e6e1f-8466-4dfe-a26c-64494c7f804b.jpg?v=1778884480"},{"product_id":"12-brass-in-line-check-valve-nbr-944403","title":"1\/2 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 1\/2 in. brass inline check valve (part \u003cstrong\u003e944403\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1\/2 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in. Viton-seal version (944403V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in. 316 SS inline check valve (949403)\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262483671,"sku":"944403","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944403_dfeb6238-d4d9-434c-9b30-729215de64d2.jpg?v=1778884481"},{"product_id":"12-brass-in-line-check-viton-944403v","title":"1\/2 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 1\/2 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944403V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1\/2 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in. Buna-N version (944403)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in. 316 SS inline check valve (949403)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262549207,"sku":"944403V","price":22.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944403V_0c93e817-d668-428f-87d7-eb45f3bcf630.jpg?v=1778884482"},{"product_id":"38-in-line-check-val-944429","title":"3\/8 in. Inline Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e3\/8 in. Inline Check Valve\u003c\/strong\u003e (#944429) is a spring-loaded brass inline check valve that allows flow in one direction and closes automatically to prevent backflow. Midland lists it for use vertically or horizontally.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass body\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSpring Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi WOG; 125 psi WSP (saturated steam)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e14°F to 248°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e944429\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body \/ Stainless spring construction\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded — closes automatically when flow stops or reverses\u003c\/li\u003e\n  \u003cli\u003eCan be used vertically or horizontally\u003c\/li\u003e\n  \u003cli\u003eCompact inline form factor — minimal installation space required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003ePump discharge, water, oil and gas lines and general industrial piping where reverse flow would damage equipment. Not lead-free — not for potable water service. For chemical service, ask us to confirm compatibility with the manufacturer before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types: Swing, Spring, Wafer, Ball\u003c\/a\u003e — Understand the differences\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/brass-check-valves\"\u003eShop Brass Check Valves\u003c\/a\u003e — Full brass check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262614743,"sku":"944429","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944429_7550c425-0ce7-4c5d-93fb-dcd78f235530.jpg?v=1778884483"},{"product_id":"34-brass-in-line-check-viton-944404v","title":"3\/4 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 3\/4 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944404V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/4 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in. Buna-N version (944404)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in. 316 SS inline check valve (949404)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262680279,"sku":"944404V","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944404V_4ce967c7-f8b9-4148-93ca-90a32220cb7b.jpg?v=1778884484"},{"product_id":"1-14-ips-brass-inline-check-valve-944433","title":"1-1\/4 in. IPS Brass Inline Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1-1\/4 in. IPS Brass Inline Check Valve\u003c\/strong\u003e (#944433) is a spring-loaded brass inline check valve that allows flow in one direction and closes automatically to prevent backflow. Midland lists it for use vertically or horizontally.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass body\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSpring Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi WOG; 125 psi WSP (saturated steam)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e14°F to 248°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e944433\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body \/ Stainless spring construction\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded — closes automatically when flow stops or reverses\u003c\/li\u003e\n  \u003cli\u003eCan be used vertically or horizontally\u003c\/li\u003e\n  \u003cli\u003eCompact inline form factor — minimal installation space required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003ePump discharge, water, oil and gas lines and general industrial piping where reverse flow would damage equipment. Not lead-free — not for potable water service. For chemical service, ask us to confirm compatibility with the manufacturer before you order.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types: Swing, Spring, Wafer, Ball\u003c\/a\u003e — Understand the differences\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/collections\/brass-check-valves\"\u003eShop Brass Check Valves\u003c\/a\u003e — Full brass check valve range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262713047,"sku":"944433","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944433_5e4bc142-c43f-4521-b671-632a1064f967.jpg?v=1778884485"},{"product_id":"1-14-brass-in-line-check-nbr-944406","title":"1-1\/4 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 1-1\/4 in. brass inline check valve (part \u003cstrong\u003e944406\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/4 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in. Viton-seal version (944406V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in. 316 SS inline check valve (949406)\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262745815,"sku":"944406","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944406_a1aec017-686a-445a-bd85-f2d5ed42670b.jpg?v=1778884486"},{"product_id":"1-14-brass-in-line-check-944406v","title":"1-1\/4 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 1-1\/4 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944406V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/4 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in. Buna-N version (944406)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in. 316 SS inline check valve (949406)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\" style=\"color:#FE8C03\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-installation-direction-orientation\" style=\"color:#FE8C03\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-sizing-guide\" style=\"color:#FE8C03\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-slamming-water-hammer\" style=\"color:#FE8C03\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-leaking-diagnosis\" style=\"color:#FE8C03\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/check-valve-chattering-noise\" style=\"color:#FE8C03\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/buna-vs-viton-check-valve-seats\" style=\"color:#FE8C03\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629262876887,"sku":"944406V","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944406V_4eb35c9a-dfac-4bfb-8c1f-58abed90a6b3.jpg?v=1778884486"},{"product_id":"12-ss-in-line-check-valve-949430","title":"1\/2 in. 304 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1\/2 in. 304 Stainless Steel Inline Check Valve\u003c\/strong\u003e (Midland part #949430) is an inline check valve with a 304 stainless steel body, female NPT threads on both ends and a fluoroelastomer seal.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949430\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003e304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003eFluoroelastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd connections\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT), thread size 1\/2 - 14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet-to-outlet length\u003c\/td\u003e\n\u003ctd\u003e2.43 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead content\u003c\/td\u003e\n\u003ctd\u003eMidland lists this model as \"Lead-Free\" (manufacturer designation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eValues are from Midland's product page for 949430. Midland does not list a pressure or temperature rating on that page; ask us and we will confirm them with Midland before you order.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eInstall with the flow arrow pointing downstream, and follow the manufacturer's installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003ch2\u003eCross-References\u003c\/h2\u003e\u003cp\u003eCVS50, RL01-108SA\u003c\/p\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48629263106263,"sku":"949430","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949430_9707adee-ec91-4c73-85cd-317a2b4f84f9.jpg?v=1778884493"},{"product_id":"1-fxf-pvc-spring-loaded-chk-vlv-940333","title":"1 in. Female x Female PVC Spring-Loaded Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1 in. Female x Female PVC Spring-Loaded Check Valve\u003c\/strong\u003e (#940333) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Female NPT connections allow direct threaded installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940333\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eFemale NPT threaded connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eCross-References\u003c\/h2\u003e\u003cp\u003e0209CV40K, 42034-16, 523T05\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/p\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48646776750295,"sku":"940333","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940333.jpg?v=1779367505"},{"product_id":"1-glue-inlne-plastic-ck-vlv-940327","title":"1 in. Glue Inline Plastic Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1 in. Glue Inline Plastic Check Valve\u003c\/strong\u003e (#940327) is a PVC inline spring check valve that allows flow in one direction and prevents reverse flow. Socket (glue) ends integrate directly into standard PVC piping systems without additional adapters.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePVC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eSocket (solvent weld)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e200 psi at 77°F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFull manufacturer spec sheet available on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e940327\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePVC body\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded poppet — automatic closure on flow reversal\u003c\/li\u003e\n  \u003cli\u003eSocket (solvent weld) connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eOne-way flow protection in PVC piping systems. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order.\u003c\/p\u003e\n\n\u003ch2\u003eCross-References\u003c\/h2\u003e\u003cp\u003e0209CV50K, 42036-16, 523S05\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/pvc-check-valves\"\u003eShop PVC Check Valves\u003c\/a\u003e — Full PVC check valve range\u003c\/p\u003e","brand":"Midland Industries","offers":[{"title":"Default Title","offer_id":48646776815831,"sku":"940327","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_940327.jpg?v=1779367506"},{"product_id":"1-4-in-316-stainless-steel-inline-check-valve-949401","title":"1\/4 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 1\/4 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949401\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e2.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1\/4 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/14-brass-in-line-check-valve-944401\"\u003e1\/4 in. brass inline check valve (944401)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740980621527,"sku":"949401","price":135.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949401.jpg?v=1780662220"},{"product_id":"3-8-in-316-stainless-steel-inline-check-valve-949402","title":"3\/8 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 3\/8 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949402\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e2.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/8 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/8 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\"\u003e3\/8 in. brass inline check valve (944402)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740980687063,"sku":"949402","price":132.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949402.jpg?v=1780662223"},{"product_id":"3-4-in-316-stainless-steel-inline-check-valve-949404","title":"3\/4 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 3\/4 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949404\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e2.87\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/4 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\"\u003e3\/4 in. brass inline check valve (944404)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740980752599,"sku":"949404","price":205.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949404.jpg?v=1780662229"},{"product_id":"1-2-in-316-stainless-steel-inline-check-valve-949403","title":"1\/2 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 1\/2 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949403\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e2.31\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1\/2 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\"\u003e1\/2 in. brass inline check valve (944403)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740990222551,"sku":"949403","price":133.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949403.jpg?v=1780662533"},{"product_id":"1-in-316-stainless-steel-inline-check-valve-949405","title":"1 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 1 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949405\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e3.50\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\"\u003e1 in. brass inline check valve (944405)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740990255319,"sku":"949405","price":227.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949405.jpg?v=1780662535"},{"product_id":"1-1-4-in-316-stainless-steel-inline-check-valve-949406","title":"1-1\/4 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 1-1\/4 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949406\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e4.18\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/4 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-14-brass-in-line-check-nbr-944406\"\u003e1-1\/4 in. brass inline check valve (944406)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740990353623,"sku":"949406","price":407.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949406.jpg?v=1780662537"},{"product_id":"1-1-2-in-316-stainless-steel-inline-check-valve-949407","title":"1-1\/2 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 1-1\/2 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949407\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e4.93\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/2 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\"\u003e1-1\/2 in. brass inline check valve (944407)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740990386391,"sku":"949407","price":592.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949407.jpg?v=1780662538"},{"product_id":"2-in-316-stainless-steel-inline-check-valve-949408","title":"2 in. 316 Stainless Steel Inline Check Valve","description":"\u003cp\u003eThe 2 in. 316 stainless steel inline check valve (part \u003cstrong\u003e949408\u003c\/strong\u003e) delivers spring-loaded, bubble-tight backflow protection in a 316 stainless steel body. ASTM A351-CF8M investment-cast body, soft PTFE seat, and a dual-guided stem and disc that seats fast at just 1\/2 psi cracking pressure. Rated 800 psi WOG and 125 psi WSP saturated steam. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), 316 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT, ANSI B1.20.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e800 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi WSP saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eAsk us — Midland's published figures differ; we confirm the rating for this model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS), investment cast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eSoft PTFE — bubble-tight shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd-to-End Length\u003c\/td\u003e\n\u003ctd\u003e6.00\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody, Center Guide, Disc \u0026amp; End Cap\u003c\/td\u003e\n\u003ctd\u003eASTM A351-CF8M (316 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e316 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Gasket\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating action; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003eDual-guided stem and disc\u003c\/li\u003e\n\u003cli\u003eHigh-capacity flow profile designed to minimize head loss\u003c\/li\u003e\n\u003cli\u003e316 stainless (ASTM A351-CF8M) construction\u003c\/li\u003e\n\u003cli\u003eInstall with flow in the direction of the body arrow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003e316 SS Inline Check Valve, 800 WOG, Female NPT (1\/4\"–2\"). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-4-in-316-stainless-steel-inline-check-valve-949401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-in-316-stainless-steel-inline-check-valve-949403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-in-316-stainless-steel-inline-check-valve-949406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e949407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e949408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on water, oil and gas lines and saturated-steam service within the 125 psi WSP rating. For chemical service, ask us — we confirm compatibility with the manufacturer for your media before you order. The 1\/2 psi cracking pressure suits low-head gravity and recirculation loops.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2 in. stainless inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water or air service on a budget? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\"\u003e2 in. brass inline check valve (944408)\u003c\/a\u003e costs less (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/valve-pressure-temperature-ratings-chart\"\u003eValve Pressure \u0026amp; Temperature Ratings Chart\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740990451927,"sku":"949408","price":928.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_949408.jpg?v=1780662541"},{"product_id":"1-2-in-inline-check-valve-vertical-or-horizontal-947143","title":"1\/2 in. Inline Check Valve, Midland 947143","description":"\u003cp\u003eThe \u003cstrong\u003e1\/2 in. Inline Check Valve, Midland 947143\u003c\/strong\u003e is a spring-loaded inline check valve with a cast bronze body and female NPT threads on both ends. Midland lists a PTFE seal and a PTFE poppet.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e947143\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003eCast bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrim (Midland)\u003c\/td\u003e\n\u003ctd\u003eBrass plug, stainless steel spring, HNBR O-ring, C360 machined brass cap, PTFE poppet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd connections\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT), thread size 1\/2 - 14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure rating\u003c\/td\u003e\n\u003ctd\u003e250 psi (Midland product page)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort\u003c\/td\u003e\n\u003ctd\u003e1\/8 in. NPT unloader port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet-to-outlet length\u003c\/td\u003e\n\u003ctd\u003e2-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead content\u003c\/td\u003e\n\u003ctd\u003eMidland lists this model as \"Contains Lead\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eValues are from Midland's product page for 947143. Ask us for any value not shown, including the temperature rating and installation position for your service.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eInstall with the flow arrow pointing downstream, and follow the manufacturer's installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741779210455,"sku":"947143","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_947143.jpg?v=1780676979"},{"product_id":"1-in-inline-check-valve-vertical-or-horizontal-947145","title":"1 in. Inline Check Valve, Midland 947145","description":"\u003cp\u003eThe \u003cstrong\u003e1 in. Inline Check Valve, Midland 947145\u003c\/strong\u003e is a spring-loaded inline check valve with a cast bronze body and female NPT threads on both ends. Midland lists a PTFE seal and a PTFE poppet.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e947145\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003eCast bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrim (Midland)\u003c\/td\u003e\n\u003ctd\u003eBrass plug, stainless steel spring, HNBR O-ring, C360 machined brass cap, PTFE poppet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd connections\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT), thread size 1 - 11-1\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure rating\u003c\/td\u003e\n\u003ctd\u003e250 psi (Midland product page)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort\u003c\/td\u003e\n\u003ctd\u003e1\/8 in. NPT unloader port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet-to-outlet length\u003c\/td\u003e\n\u003ctd\u003e3.61 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead content\u003c\/td\u003e\n\u003ctd\u003eMidland lists this model as \"Contains Lead\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eValues are from Midland's product page for 947145. Ask us for any value not shown, including the temperature rating and installation position for your service.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eInstall with the flow arrow pointing downstream, and follow the manufacturer's installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741780521175,"sku":"947145","price":121.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_947145.jpg?v=1780676995"},{"product_id":"3-4-in-brass-inline-check-valve-buna-n-944404","title":"3\/4 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 3\/4 in. brass inline check valve (part \u003cstrong\u003e944404\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/4 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/34-brass-in-line-check-viton-944404v\"\u003e3\/4 in. Viton-seal version (944404V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-4-in-316-stainless-steel-inline-check-valve-949404\"\u003e3\/4 in. 316 SS inline check valve (949404)\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741780947159,"sku":"944404","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944404.jpg?v=1780676997"},{"product_id":"3-4-in-inline-check-valve-vertical-or-horizontal-947144","title":"3\/4 in. Inline Check Valve, Midland 947144","description":"\u003cp\u003eThe \u003cstrong\u003e3\/4 in. Inline Check Valve, Midland 947144\u003c\/strong\u003e is a spring-loaded inline check valve with a cast bronze body and female NPT threads on both ends. Midland lists a PTFE seal and a PTFE poppet.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e947144\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003eCast bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrim (Midland)\u003c\/td\u003e\n\u003ctd\u003eBrass plug, stainless steel spring, HNBR O-ring, C360 machined brass cap, PTFE poppet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd connections\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT), thread size 3\/4 - 14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure rating\u003c\/td\u003e\n\u003ctd\u003e250 psi (Midland product page)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort\u003c\/td\u003e\n\u003ctd\u003e1\/8 in. NPT unloader port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet-to-outlet length\u003c\/td\u003e\n\u003ctd\u003e2.88 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead content\u003c\/td\u003e\n\u003ctd\u003eMidland lists this model as \"Contains Lead\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eValues are from Midland's product page for 947144. Ask us for any value not shown, including the temperature rating and installation position for your service.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eInstall with the flow arrow pointing downstream, and follow the manufacturer's installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e or send us your existing part number to match.\u003c\/p\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741840945367,"sku":"947144","price":76.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_947144.jpg?v=1780678998"},{"product_id":"3-8-in-brass-inline-check-valve-buna-n-944402","title":"3\/8 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 3\/8 in. brass inline check valve (part \u003cstrong\u003e944402\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/8 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3\/8 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-8-in-316-stainless-steel-inline-check-valve-949402\"\u003e3\/8 in. 316 SS inline check valve (949402)\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741841010903,"sku":"944402","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944402.jpg?v=1780679002"},{"product_id":"1-in-brass-inline-check-valve-buna-n-944405","title":"1 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 1 in. brass inline check valve (part \u003cstrong\u003e944405\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\"\u003e1 in. Viton-seal version (944405V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\"\u003e1 in. 316 SS inline check valve (949405)\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741841043671,"sku":"944405","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944405.jpg?v=1780679004"},{"product_id":"1-in-brass-inline-check-valve-viton-944405v","title":"1 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 1 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944405V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\"\u003e1 in. Buna-N version (944405)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-in-316-stainless-steel-inline-check-valve-949405\"\u003e1 in. 316 SS inline check valve (949405)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741841076439,"sku":"944405V","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944405V.jpg?v=1780679006"},{"product_id":"1-1-2-in-brass-inline-check-valve-buna-n-944407","title":"1-1\/2 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 1-1\/2 in. brass inline check valve (part \u003cstrong\u003e944407\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/2 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\"\u003e1-1\/2 in. Viton-seal version (944407V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\"\u003e1-1\/2 in. 316 SS inline check valve (949407)\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741841273047,"sku":"944407","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944407.jpg?v=1780679010"},{"product_id":"1-1-2-in-brass-inline-check-valve-viton-944407v","title":"1-1\/2 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 1-1\/2 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944407V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 1-1\/2 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\"\u003e1-1\/2 in. Buna-N version (944407)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/1-1-2-in-316-stainless-steel-inline-check-valve-949407\"\u003e1-1\/2 in. 316 SS inline check valve (949407)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741850546391,"sku":"944407V","price":94.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944407V.jpg?v=1780679318"},{"product_id":"2-in-brass-inline-check-valve-buna-n-944408","title":"2 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 2 in. brass inline check valve (part \u003cstrong\u003e944408\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\"\u003e2 in. Viton-seal version (944408V)\u003c\/a\u003e handles fuels and runs to 325°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\"\u003e2 in. 316 SS inline check valve (949408)\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741850579159,"sku":"944408","price":123.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944408.jpg?v=1780679319"},{"product_id":"2-in-brass-inline-check-valve-viton-944408v","title":"2 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 2 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944408V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 400 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e400 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\"\u003e2 in. Buna-N version (944408)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F. Need a stainless body? See the \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-316-stainless-steel-inline-check-valve-949408\"\u003e2 in. 316 SS inline check valve (949408)\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741850611927,"sku":"944408V","price":122.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944408V.jpg?v=1780679320"},{"product_id":"2-1-2-in-brass-inline-check-valve-buna-n-944409","title":"2-1\/2 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 2-1\/2 in. brass inline check valve (part \u003cstrong\u003e944409\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e2-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2-1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2-1\/2 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\"\u003e2-1\/2 in. Viton-seal version (944409V)\u003c\/a\u003e handles fuels and runs to 325°F.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741850644695,"sku":"944409","price":287.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944409.jpg?v=1780679323"},{"product_id":"2-1-2-in-brass-inline-check-valve-viton-944409v","title":"2-1\/2 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 2-1\/2 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944409V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e2-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2-1\/2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2-1\/2 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\"\u003e2-1\/2 in. Buna-N version (944409)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741850841303,"sku":"944409V","price":250.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944409V.jpg?v=1780679328"},{"product_id":"3-in-brass-inline-check-valve-buna-n-944410","title":"3 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 3 in. brass inline check valve (part \u003cstrong\u003e944410\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\"\u003e3 in. Viton-seal version (944410V)\u003c\/a\u003e handles fuels and runs to 325°F.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741854314711,"sku":"944410","price":360.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944410.jpg?v=1780679815"},{"product_id":"3-in-brass-inline-check-valve-viton-944410v","title":"3 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 3 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944410V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\"\u003e3 in. Buna-N version (944410)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741854347479,"sku":"944410V","price":390.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944410V.jpg?v=1780679817"},{"product_id":"4-in-brass-inline-check-valve-buna-n-944411","title":"4 in. Brass Inline Check Valve, Buna-N","description":"\u003cp\u003eThe 4 in. brass inline check valve (part \u003cstrong\u003e944411\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e+10°F to 210°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eBuna-N (NBR) — water, oils, general purpose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eNBR (Buna-N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Buna-N, Female NPT (1\/4\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/14-brass-in-line-check-valve-944401\" style=\"color:#FE8C03\"\u003e1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944401\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-8-in-brass-inline-check-valve-buna-n-944402\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-valve-nbr-944403\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-in-brass-inline-check-valve-buna-n-944404\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-buna-n-944405\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-nbr-944406\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-buna-n-944407\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-buna-n-944408\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-buna-n-944409\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-buna-n-944410\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944411\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on non-potable water, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1\/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 4 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-brass-inline-check-valve-viton-944411v\"\u003e4 in. Viton-seal version (944411V)\u003c\/a\u003e handles fuels and runs to 325°F.\u003c\/p\u003e\n\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741854380247,"sku":"944411","price":639.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944411.jpg?v=1780679819"},{"product_id":"4-in-brass-inline-check-valve-viton-944411v","title":"4 in. Brass Inline Check Valve, Viton","description":"\u003cp\u003eThe 4 in. brass inline check valve with Viton seal (part \u003cstrong\u003e944411V\u003c\/strong\u003e) provides compact, spring-loaded backflow prevention with a Viton (FKM) seal, which Midland specifies for fuels and hydrocarbons; rated to a maximum of 325°F and 125 psi steam. Rated 175 psi WOG with a low 1\/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eInline check valve (spring-loaded poppet), brass, Viton seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFemale NPT × Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Rating\u003c\/td\u003e\n\u003ctd\u003e175 psi WOG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam Rating\u003c\/td\u003e\n\u003ctd\u003e125 psi saturated steam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e325°F (Viton seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCracking Pressure\u003c\/td\u003e\n\u003ctd\u003e1\/2 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \/ Seal\u003c\/td\u003e\n\u003ctd\u003eViton (FKM fluoroelastomer) — fuels, hydrocarbons, elevated temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMaterials of Construction\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody \u0026amp; End Connection\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003ePolyetherimide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003ePerformance \u0026amp; Testing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eViton (FKM) seal — specified by Midland for fuels and hydrocarbons, to 325°F\u003c\/li\u003e\n\u003cli\u003eLow 1\/2 psi cracking pressure — opens with minimal upstream pressure\u003c\/li\u003e\n\u003cli\u003eSpring-loaded for fast seating; perfect seating at both high and low pressure\u003c\/li\u003e\n\u003cli\u003ePatented disc guide prevents side loading\u003c\/li\u003e\n\u003cli\u003eCompact, high-capacity design with a head-loss-minimizing flow profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot lead-free\u003c\/strong\u003e — not for potable water service\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"series-sizes\"\u003e\n\u003ch3\u003eOther Sizes in This Series\u003c\/h3\u003e\n\u003cp\u003eBrass Inline Check Valve, Viton (FKM) seal, Female NPT (3\/8\"–4\"; 400 WOG through 2\", 175 WOG above). Jump to another size or add it straight to your cart:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/38-brass-in-line-valve-viton-944402v\" style=\"color:#FE8C03\"\u003e3\/8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944402V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/12-brass-in-line-check-viton-944403v\" style=\"color:#FE8C03\"\u003e1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944403V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/34-brass-in-line-check-viton-944404v\" style=\"color:#FE8C03\"\u003e3\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944404V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-in-brass-inline-check-valve-viton-944405v\" style=\"color:#FE8C03\"\u003e1 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944405V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-14-brass-in-line-check-944406v\" style=\"color:#FE8C03\"\u003e1-1\/4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944406V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-in-brass-inline-check-valve-viton-944407v\" style=\"color:#FE8C03\"\u003e1-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944407V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-in-brass-inline-check-valve-viton-944408v\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944408V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-brass-inline-check-valve-viton-944409v\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944409V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-brass-inline-check-valve-viton-944410v\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e944410V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e4 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e944411V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eBackflow prevention on fuel, oil and hydrocarbon lines, including service above the 210°F limit of the Buna-N version (to 325°F). The 1\/2 psi cracking pressure also suits low-head gravity and recirculation systems. Not for potable water supply (not lead-free).\u003c\/p\u003e\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 4 in. brass inline check valve with FKM\/Viton trim? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Water, air, or general-purpose service? The \u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-brass-inline-check-valve-buna-n-944411\"\u003e4 in. Buna-N version (944411)\u003c\/a\u003e covers water, oils and general-purpose service up to 210°F.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained (Swing vs. Spring vs. Wafer)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741854478551,"sku":"944411V","price":560.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944411V.jpg?v=1780679823"},{"product_id":"1-4-in-inline-check-valve-944428","title":"1\/4 in. Inline Check Valve","description":"\u003cp\u003eThe \u003cstrong\u003e1\/4 in. Brass Inline Check Valve (#944428)\u003c\/strong\u003e is a compact brass spring-loaded inline check valve that allows flow in one direction and automatically prevents reverse flow (backflow). It installs in vertical or horizontal runs and closes on flow reversal.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944428\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eInline Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded inline poppet — closes on flow reversal\u003c\/li\u003e\n\u003cli\u003eCompact brass body\u003c\/li\u003e\n\u003cli\u003eInstalls vertically or horizontally\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003ePump and compressor discharge, water and air lines, and general industrial flow systems requiring dependable backflow prevention. Not lead-free — not for potable water service.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741854511319,"sku":"944428","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944428.jpg?v=1780679824"},{"product_id":"1-2-in-brass-inline-check-valve-threaded-944430","title":"1\/2 in. Brass Inline Check Valve, Threaded","description":"\u003cp\u003eThe \u003cstrong\u003e1\/2 in. Brass Inline Check Valve, Threaded (#944430)\u003c\/strong\u003e is a brass spring-loaded inline check valve with threaded (NPT) ends that allows flow in one direction and automatically prevents reverse flow (backflow).\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944430\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eInline Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded inline poppet — closes on flow reversal\u003c\/li\u003e\n\u003cli\u003eBrass body with threaded (NPT) ends\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003ePump and compressor discharge, water and air lines, and general industrial flow systems requiring dependable backflow prevention. Not lead-free — not for potable water service.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741863686359,"sku":"944430","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944430.jpg?v=1780680983"},{"product_id":"3-4-in-brass-inline-check-valve-threaded-944431","title":"3\/4 in. Brass Inline Check Valve, Threaded","description":"\u003cp\u003eThe \u003cstrong\u003e3\/4 in. Brass Inline Check Valve, Threaded (#944431)\u003c\/strong\u003e is a brass spring-loaded inline check valve with threaded (NPT) ends that allows flow in one direction and automatically prevents reverse flow (backflow).\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944431\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e3\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eInline Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded inline poppet — closes on flow reversal\u003c\/li\u003e\n\u003cli\u003eBrass body with threaded (NPT) ends\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003ePump and compressor discharge, water and air lines, and general industrial flow systems requiring dependable backflow prevention. Not lead-free — not for potable water service.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741863719127,"sku":"944431","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944431.jpg?v=1780680985"},{"product_id":"1-in-brass-inline-check-valve-threaded-944432","title":"1 in. Brass Inline Check Valve, Threaded","description":"\u003cp\u003eThe \u003cstrong\u003e1 in. Brass Inline Check Valve, Threaded (#944432)\u003c\/strong\u003e is a brass spring-loaded inline check valve with threaded (NPT) ends that allows flow in one direction and automatically prevents reverse flow (backflow).\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944432\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eInline Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded inline poppet — closes on flow reversal\u003c\/li\u003e\n\u003cli\u003eBrass body with threaded (NPT) ends\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003ePump and compressor discharge, water and air lines, and general industrial flow systems requiring dependable backflow prevention. Not lead-free — not for potable water service.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741863751895,"sku":"944432","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944432.jpg?v=1780680986"},{"product_id":"1-1-2-in-brass-inline-check-valve-threaded-944434","title":"1-1\/2 in. Brass Inline Check Valve, Threaded","description":"\u003cp\u003eThe \u003cstrong\u003e1-1\/2 in. Brass Inline Check Valve, Threaded (#944434)\u003c\/strong\u003e is a brass spring-loaded inline check valve with threaded (NPT) ends that allows flow in one direction and automatically prevents reverse flow (backflow).\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e944434\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eInline Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFPT x FPT (female NPT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded inline poppet — closes on flow reversal\u003c\/li\u003e\n\u003cli\u003eBrass body with threaded (NPT) ends\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003ePump and compressor discharge, water and air lines, and general industrial flow systems requiring dependable backflow prevention. Not lead-free — not for potable water service.\u003c\/p\u003e\u003ch2\u003eTechnical Resources\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/pages\/check-valve-types-explained\"\u003eCheck Valve Types Explained\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c!-- apex-guide-links --\u003e\n\u003cdiv style=\"margin-top:24px;padding:16px 20px;border:1px solid #ddd;border-radius:6px;background:#fafafa;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:1.05rem;\"\u003eExpert Guides for This Product\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-installation-direction-orientation\"\u003eCheck Valve Orientation \u0026amp; Installation\u003c\/a\u003e — flow direction and mounting rules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-sizing-guide\"\u003eCheck Valve Sizing Guide\u003c\/a\u003e — why line size isn't valve size\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-slamming-water-hammer\"\u003eSlamming \u0026amp; Water Hammer\u003c\/a\u003e — causes and fixes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-leaking-diagnosis\"\u003eCheck Valve Leaking?\u003c\/a\u003e — diagnose and fix it\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/check-valve-chattering-noise\"\u003eCheck Valve Chattering\u003c\/a\u003e — the sizing problem nobody checks\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color:#FE8C03\" href=\"\/pages\/buna-vs-viton-check-valve-seats\"\u003eBuna vs. Viton Seats\u003c\/a\u003e — which elastomer fits your media\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- \/apex-guide-links --\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48741863784663,"sku":"944434","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_944434.jpg?v=1780680988"}],"url":"https:\/\/apexflowsolutions.com\/collections\/inline-check-valves.oembed?page=3","provider":"Apex Flow Solutions","version":"1.0","type":"link"}