{"title":"Ductile Iron Check Valves","description":"\u003cp\u003eThis collection gathers ductile-iron check valves: flanged swing bodies, including lever-and-weight versions, and double-door wafer bodies, in larger sizes from 2 in. to 16 in. Certain models carry a manufacturer-listed AWWA C508 or UL\/FM designation; those designations apply only to the individual products that state them, not to the whole collection. Where a designation is required for a project, confirm the specific SKU's documentation.\u003c\/p\u003e\n\u003ch3\u003eWhat is grouped here\u003c\/h3\u003e\n\u003cp\u003eThe group includes ductile-iron flanged swing checks (with AWWA C508 and UL\/FM manufacturer-listed on specific models), lever-and-weight swing checks, and ductile-iron double-door wafer checks that bolt between flanges. For wafer bodies on their own, see \u003ca href=\"\/collections\/wafer-check-valves\"\u003ewafer check valves\u003c\/a\u003e; for smaller swing checks, see \u003ca href=\"\/collections\/swing-check-valves\"\u003eswing check valves\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eChoosing a ductile-iron check valve\u003c\/h3\u003e\n\u003cp\u003eThe \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 page\u003c\/a\u003e covers the waterworks swing series, and the \u003ca href=\"\/pages\/check-valve-types-explained\"\u003echeck valve types guide\u003c\/a\u003e explains how flanged swing and double-door wafer bodies differ. Confirm size, connection, and flange fit against the product specification.\u003c\/p\u003e","products":[{"product_id":"3-in-ductile-iron-swing-check-valve-flanged-awwa-c508-962003","title":"3 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e3 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508 (#962003)\u003c\/strong\u003e is a ductile iron swing check valve that allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. It bolts between standard pipe flanges. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e962003\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eAutomatic backflow prevention — opens with forward flow, closes on reverse\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740367401175,"sku":"962003","price":565.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962003.jpg?v=1780646572"},{"product_id":"4-in-ductile-iron-swing-check-valve-flanged-awwa-c508-962004","title":"4 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e4 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508 (#962004)\u003c\/strong\u003e is a ductile iron swing check valve that allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. It bolts between standard pipe flanges. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e962004\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eAutomatic backflow prevention — opens with forward flow, closes on reverse\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740367433943,"sku":"962004","price":856.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962003_1a56b529-fc39-4b20-9206-0f10dc4fbee8.jpg?v=1781564818"},{"product_id":"6-in-ductile-iron-swing-check-valve-flanged-awwa-c508-962006","title":"6 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e6 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508 (#962006)\u003c\/strong\u003e is a ductile iron swing check valve that allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. It bolts between standard pipe flanges. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e962006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e6 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eAutomatic backflow prevention — opens with forward flow, closes on reverse\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740367466711,"sku":"962006","price":1514.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962003_23395f6f-06ca-4437-a426-954176e5733e.jpg?v=1781565140"},{"product_id":"8-in-ductile-iron-swing-check-valve-flanged-awwa-c508-962008","title":"8 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e8 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508 (#962008)\u003c\/strong\u003e is a ductile iron swing check valve that allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. It bolts between standard pipe flanges. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e962008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eAutomatic backflow prevention — opens with forward flow, closes on reverse\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740367499479,"sku":"962008","price":2330.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962003_1ff69117-b650-4946-9e21-d9ffcc1350f6.jpg?v=1781565141"},{"product_id":"10-in-ductile-iron-swing-check-valve-flanged-awwa-c508-962010","title":"10 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e10 in. Ductile Iron Swing Check Valve, Flanged — AWWA C508 (#962010)\u003c\/strong\u003e is a ductile iron swing check valve that allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. It bolts between standard pipe flanges. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e962010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e10 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eAutomatic backflow prevention — opens with forward flow, closes on reverse\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eLow-maintenance, self-operating design\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740367532247,"sku":"962010","price":1551.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962003_cea80916-712b-40a3-a433-79e639f7b1e6.jpg?v=1781565141"},{"product_id":"3-in-ductile-iron-swing-check-valve-lever-weight-awwa-c508-96203lw","title":"3 in. Ductile Iron Swing Check Valve, Lever \u0026 Weight — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e3 in. Ductile Iron Swing Check Valve, Lever \u0026amp; Weight — AWWA C508 (#96203LW)\u003c\/strong\u003e is a ductile iron swing check valve with an external lever and weight for controlled, non-slam closure. It allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96203LW\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve (Lever \u0026amp; Weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eExternal lever and weight for controlled, non-slam closure\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740369400023,"sku":"96203LW","price":650.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010LW.jpg?v=1781565141"},{"product_id":"4-in-ductile-iron-swing-check-valve-lever-weight-awwa-c508-96204lw","title":"4 in. Ductile Iron Swing Check Valve, Lever \u0026 Weight — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e4 in. Ductile Iron Swing Check Valve, Lever \u0026amp; Weight — AWWA C508 (#96204LW)\u003c\/strong\u003e is a ductile iron swing check valve with an external lever and weight for controlled, non-slam closure. It allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment. Built for reliable, low-maintenance service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96204LW\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve (Lever \u0026amp; Weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eExternal lever and weight for controlled, non-slam closure\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740369465559,"sku":"96204LW","price":1015.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010LW_e3df633f-95bf-4fc0-8d08-e8d2609d6baa.jpg?v=1781565141"},{"product_id":"6-in-ductile-iron-swing-check-valve-lever-weight-awwa-c508-96206lw","title":"6 in. Ductile Iron Swing Check Valve, Lever \u0026 Weight — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e6 in. Ductile Iron Swing Check Valve, Lever \u0026amp; Weight — AWWA C508 (#96206LW)\u003c\/strong\u003e is a ductile iron swing check valve with an external lever and weight for controlled, non-slam closure. It allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96206LW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e6 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve (Lever \u0026amp; Weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eExternal lever and weight for controlled, non-slam closure\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740390994135,"sku":"96206LW","price":1548.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010LW_553ea8a6-ccd9-4f79-98d6-926ae88380bb.jpg?v=1781565142"},{"product_id":"8-in-ductile-iron-swing-check-valve-lever-weight-awwa-c508-96208lw","title":"8 in. Ductile Iron Swing Check Valve, Lever \u0026 Weight — AWWA C508","description":"\u003cp\u003eThe \u003cstrong\u003e8 in. Ductile Iron Swing Check Valve, Lever \u0026amp; Weight — AWWA C508 (#96208LW)\u003c\/strong\u003e is a ductile iron swing check valve with an external lever and weight for controlled, non-slam closure. It allows flow in one direction and automatically prevents reverse flow (backflow) to protect pumps and equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96208LW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve (Lever \u0026amp; Weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eAWWA C508\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\u003eExternal lever and weight for controlled, non-slam closure\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003cli\u003eMeets AWWA C508\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eWater distribution and treatment, HVAC, pump discharge lines, fire protection, irrigation, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740391157975,"sku":"96208LW","price":2514.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010LW_8b489bcf-c9f7-4343-ab4a-fc5f0696d0a9.jpg?v=1781565142"},{"product_id":"4-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963004ul","title":"4 in. Ductile Iron Double Door Wafer Check Valve, UL\/FM","description":"\u003cp\u003eThe 4 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963004UL\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs. UL 312\/ULC listed with fusion-bonded epoxy coating inside and out — built for fire protection service.\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\u003e963004UL\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\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eListing\u003c\/td\u003e\n\u003ctd\u003eUL 312 \/ ULC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Pressure\u003c\/td\u003e\n\u003ctd\u003e300 psi @ 32–189°F (0–87°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eFusion-bonded epoxy, interior \u0026amp; exterior (AWWA C550)\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e64 mm \/ 2.52\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e162 mm \/ 6.38\"\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\u003c\/li\u003e\n\u003cli\u003eUL 312\/ULC listed; fusion-bonded epoxy coated to AWWA C550 for fire-line 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\u003eDuctile Iron Double Door Wafer Check Valve. 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\u003e4 in. UL\/FM (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963004UL\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963006ul\" style=\"color:#FE8C03\"\u003e6 in. UL\/FM\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006UL\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eFor general water and HVAC service, the \u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003estandard version of this size\u003c\/a\u003e costs less.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eFire protection mains, sprinkler and standpipe systems, and pump discharge lines requiring UL 312\/ULC listed backflow prevention.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 4 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740391223511,"sku":"963004UL","price":272.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963004UL.jpg?v=1780647700"},{"product_id":"6-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963006ul","title":"6 in. Ductile Iron Double Door Wafer Check Valve, UL\/FM","description":"\u003cp\u003eThe 6 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963006UL\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs. UL 312\/ULC listed with fusion-bonded epoxy coating inside and out — built for fire protection service.\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\u003e963006UL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e6 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eListing\u003c\/td\u003e\n\u003ctd\u003eUL 312 \/ ULC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Pressure\u003c\/td\u003e\n\u003ctd\u003e300 psi @ 32–189°F (0–87°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eFusion-bonded epoxy, interior \u0026amp; exterior (AWWA C550)\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e76 mm \/ 2.99\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e218 mm \/ 8.58\"\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\u003c\/li\u003e\n\u003cli\u003eUL 312\/ULC listed; fusion-bonded epoxy coated to AWWA C550 for fire-line 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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/4-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963004ul\" style=\"color:#FE8C03\"\u003e4 in. UL\/FM\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004UL\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e6 in. UL\/FM (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963006UL\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eFor general water and HVAC service, the \u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003estandard version of this size\u003c\/a\u003e costs less.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003eFire protection mains, sprinkler and standpipe systems, and pump discharge lines requiring UL 312\/ULC listed backflow prevention.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 6 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740391256279,"sku":"963006UL","price":520.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963004UL_b64c8312-a803-42c4-95b9-454356ef260c.jpg?v=1781565179"},{"product_id":"2-in-ductile-iron-double-door-wafer-check-valve-963002","title":"2 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 2 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963002\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963002\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\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e54 mm \/ 2.13\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e102 mm \/ 4.02\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\u003e2 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740391289047,"sku":"963002","price":71.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002.jpg?v=1780647708"},{"product_id":"3-in-ductile-iron-double-door-wafer-check-valve-963003","title":"3 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 3 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963003\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963003\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\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e57 mm \/ 2.24\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e134 mm \/ 5.28\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e8 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\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\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 3 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740391321815,"sku":"963003","price":108.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_db956bb8-14f6-464d-a3a5-7413a75aa3ac.jpg?v=1781565178"},{"product_id":"4-in-ductile-iron-double-door-wafer-check-valve-963004","title":"4 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 4 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963004\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963004\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\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e64 mm \/ 2.52\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e162 mm \/ 6.38\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e13 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\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\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eSpeccing a fire protection line? This size also comes \u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963004ul\"\u003eUL 312\/ULC listed with FBE coating\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 4 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393746647,"sku":"963004","price":151.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_179ea728-bfb1-4845-aec7-53e69ee3511b.jpg?v=1781565178"},{"product_id":"5-in-ductile-iron-double-door-wafer-check-valve-963005","title":"5 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 5 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963005\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963005\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e5 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e70 mm \/ 2.76\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e192 mm \/ 7.56\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e16 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 5 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393779415,"sku":"963005","price":201.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_cf03f037-da3b-4d3a-8b53-92568aae6706.jpg?v=1781565178"},{"product_id":"6-in-ductile-iron-double-door-wafer-check-valve-963006","title":"6 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 6 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963006\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e6 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e76 mm \/ 2.99\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e218 mm \/ 8.58\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e20 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e6 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eSpeccing a fire protection line? This size also comes \u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963006ul\"\u003eUL 312\/ULC listed with FBE coating\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cp\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 6 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393844951,"sku":"963006","price":271.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_d39f51c5-5c5e-4ca9-806a-0abf6ec48c23.jpg?v=1781565178"},{"product_id":"8-in-ductile-iron-double-door-wafer-check-valve-963008","title":"8 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 8 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963008\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e95 mm \/ 3.74\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e273 mm \/ 10.75\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e38 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e8 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 8 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393877719,"sku":"963008","price":640.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_62665a78-e25c-44e7-aaab-e20fe98fde72.jpg?v=1781565179"},{"product_id":"10-in-ductile-iron-double-door-wafer-check-valve-963010","title":"10 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 10 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963010\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e10 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e108 mm \/ 4.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e335 mm \/ 13.19\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e38 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e10 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 10 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393910487,"sku":"963010","price":665.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_e70d5c61-a95e-4809-8b92-d8d224e42ad2.jpg?v=1781565179"},{"product_id":"16-in-ductile-iron-double-door-wafer-check-valve-963016","title":"16 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 16 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963016\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e16 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e191 mm \/ 7.52\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e511 mm \/ 20.12\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e165 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\" style=\"color:#FE8C03\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e16 in. (this page)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 16 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393943255,"sku":"963016","price":3088.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_2b8919ab-b537-472d-bcbd-d1b48e3444d6.jpg?v=1781565179"},{"product_id":"2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025","title":"2-1\/2 in. Ductile Iron Double Door Wafer Check Valve","description":"\u003cp\u003eThe 2-1\/2 in. ductile iron double door wafer check valve (part \u003cstrong\u003e963025\u003c\/strong\u003e) uses twin spring-loaded aluminum bronze doors for fast, non-slam closure and very low headloss. The compact wafer body installs between ASME B16.1 Class 125 \/ ASME B16.5 Class 150 flanges, in vertical or horizontal runs.\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\u003e963025\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\u003eDouble door (dual plate) wafer check valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded twin doors — fast, non-slam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal; fits between ASME B16.1 Class 125 \/ B16.5 Class 150 flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat\u003c\/td\u003e\n\u003ctd\u003eResilient EPDM — tight sealing even at low differential pressure\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\u003eFace-to-Face Length (L)\u003c\/td\u003e\n\u003ctd\u003e54 mm \/ 2.13\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Outside Diameter\u003c\/td\u003e\n\u003ctd\u003e121 mm \/ 4.76\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5 lb\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\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron ASTM 65-45-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoors (Discs)\u003c\/td\u003e\n\u003ctd\u003eAluminum Bronze C954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003e420 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat \u0026amp; Seal Ring\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGaskets\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel ASTM A325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwin spring-loaded doors close before reverse flow develops — minimizes water hammer\u003c\/li\u003e\n\u003cli\u003eWafer pattern: a fraction of the weight and face-to-face length of a swing check\u003c\/li\u003e\n\u003cli\u003eExcellent flow characteristics and low pressure loss at high flow rates\u003c\/li\u003e\n\u003cli\u003eResilient seat seals tight even at low differential pressure\u003c\/li\u003e\n\u003cli\u003eMounts vertical or horizontal\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\u003eDuctile Iron Double Door Wafer Check Valve. 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\/2-in-ductile-iron-double-door-wafer-check-valve-963002\" style=\"color:#FE8C03\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\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\u003e963025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\" style=\"color:#FE8C03\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\" style=\"color:#FE8C03\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\" style=\"color:#FE8C03\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\" style=\"color:#FE8C03\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\" style=\"color:#FE8C03\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\" style=\"color:#FE8C03\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\" style=\"color:#FE8C03\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\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\u003ePump discharge backflow prevention, HVAC chilled and condenser water, water and wastewater treatment, booster and circulation loops, and tight-quarters retrofits where a swing check won't fit. EPDM seat: water-based services — not for oils or fuels.\u003c\/p\u003e\n\u003ch2\u003eCross-References \u0026amp; Interchange\u003c\/h2\u003e\u003cp\u003eReplacing another brand's 2-1\/2 in. dual-plate wafer check? These interchange dimensionally with standard ASME Class 125\/150 wafer checks — match nominal size and flange class, or send us your part number and we will confirm the fit.\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, Spring, Wafer, Ball)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/water-hammer-causes-and-fixes\"\u003eWater Hammer: Causes \u0026amp; Fixes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca style=\"color:#FE8C03\" href=\"\/pages\/how-to-choose-the-right-valve\"\u003eHow to Choose the Right Valve\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":48740393976023,"sku":"963025","price":81.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_963002_553d4bf5-0a09-4688-954b-99901e7b6e41.jpg?v=1781565177"},{"product_id":"3-in-ductile-iron-swing-check-valve-flanged-ul-fm-96203ul","title":"3 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM","description":"\u003cp\u003eThe \u003cstrong\u003e3 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM (#96203UL)\u003c\/strong\u003e is a UL Listed \/ FM Approved ductile iron swing check valve for fire-protection service. It allows flow in one direction and automatically prevents reverse flow (backflow). It bolts between standard pipe flanges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96203UL\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eUL\/FM\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\u003eUL Listed \/ FM Approved for fire-protection service\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eFire protection systems, water distribution, pump discharge lines, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740397023447,"sku":"96203UL","price":516.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010UL.jpg?v=1781565142"},{"product_id":"4-in-ductile-iron-swing-check-valve-flanged-ul-fm-96204ul","title":"4 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM","description":"\u003cp\u003eThe \u003cstrong\u003e4 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM (#96204UL)\u003c\/strong\u003e is a UL Listed \/ FM Approved ductile iron swing check valve for fire-protection service. It allows flow in one direction and automatically prevents reverse flow (backflow). It bolts between standard pipe flanges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96204UL\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eUL\/FM\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\u003eUL Listed \/ FM Approved for fire-protection service\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eFire protection systems, water distribution, pump discharge lines, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740397056215,"sku":"96204UL","price":842.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010UL_b37dec98-cadb-4c51-99c2-636e8463ef94.jpg?v=1781565142"},{"product_id":"6-in-ductile-iron-swing-check-valve-flanged-ul-fm-96206ul","title":"6 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM","description":"\u003cp\u003eThe \u003cstrong\u003e6 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM (#96206UL)\u003c\/strong\u003e is a UL Listed \/ FM Approved ductile iron swing check valve for fire-protection service. It allows flow in one direction and automatically prevents reverse flow (backflow). It bolts between standard pipe flanges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96206UL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e6 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eUL\/FM\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\u003eUL Listed \/ FM Approved for fire-protection service\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eFire protection systems, water distribution, pump discharge lines, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740397121751,"sku":"96206UL","price":1284.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010UL_8f0293de-bb1d-4b83-89f8-904f15838180.jpg?v=1781565143"},{"product_id":"8-in-ductile-iron-swing-check-valve-flanged-ul-fm-96208ul","title":"8 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM","description":"\u003cp\u003eThe \u003cstrong\u003e8 in. Ductile Iron Swing Check Valve, Flanged — UL\/FM (#96208UL)\u003c\/strong\u003e is a UL Listed \/ FM Approved ductile iron swing check valve for fire-protection service. It allows flow in one direction and automatically prevents reverse flow (backflow). It bolts between standard pipe flanges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock — ships in 2–3 business days.\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\u003e96208UL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSwing Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eFlanged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eUL\/FM\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\u003eUL Listed \/ FM Approved for fire-protection service\u003c\/li\u003e\n\u003cli\u003eAutomatic backflow prevention\u003c\/li\u003e\n\u003cli\u003eDuctile Iron construction\u003c\/li\u003e\n\u003cli\u003eFlanged connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eFire protection systems, water distribution, pump discharge lines, and general industrial flow systems requiring dependable backflow prevention.\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\u003cdiv class=\"afs-guide-box\"\u003e\u003cp\u003eTechnical reference: \u003ca href=\"\/pages\/awwa-c508-swing-check-valves\"\u003eAWWA C508 swing check valve guide\u003c\/a\u003e — compare available sizes and configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"Default","offer_id":48740397154519,"sku":"96208UL","price":2256.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4152\/8791\/files\/MIDLANDINDUSTRIES_962010UL_9524eb85-c3b6-40e8-a1ee-a8e011db5c37.jpg?v=1781565143"}],"url":"https:\/\/apexflowsolutions.com\/collections\/ductile-iron-check-valves.oembed","provider":"Apex Flow Solutions","version":"1.0","type":"link"}