{"title":"Wafer Check Valves","description":"\u003cp\u003eWafer check valves use two spring-loaded half-discs that fold together against reverse flow inside a thin body that bolts directly between two pipe flanges. The double-door design is far shorter and lighter than a flanged swing check at the same size, which is why it is specified on large-diameter water, HVAC, and fire-protection lines where weight and lay length matter. Apex Flow Solutions stocks ductile iron double-door wafer checks from 2 in. to 16 in.\u003c\/p\u003e\u003ch3\u003eWhere wafer checks are used\u003c\/h3\u003e\u003cp\u003eFire protection is the biggest application, and we carry UL\/FM listed models for sprinkler and standpipe risers. Beyond fire, wafer checks are common on HVAC chilled and condenser water, pump discharge headers, and municipal water where a compact, low-cost check between flanges beats a bulky swing body. For threaded brass or smaller lines, use a \u003ca href=\"\/collections\/swing-check-valves\"\u003eswing check\u003c\/a\u003e instead.\u003c\/p\u003e\u003ch3\u003eSizing and installation\u003c\/h3\u003e\u003cp\u003eWafer bodies center between ANSI flanges and are held by the through-bolts of the flange joint, so they have no flanged ends of their own. Match the valve size to your line size and confirm flange class. The spring-loaded doors close quickly, which helps control slam on pump lines. These are heavy items and ship LTL freight.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eWafer check or swing check?\u003c\/h4\u003e\u003cp\u003eWafer wins on large lines where compactness and weight matter and where UL\/FM fire listing is required. A \u003ca href=\"\/collections\/swing-check-valves\"\u003eswing check\u003c\/a\u003e gives the lowest pressure drop and is simpler to service on smaller threaded lines.\u003c\/p\u003e\u003ch4\u003eDo wafer check valves need a gasket?\u003c\/h4\u003e\u003cp\u003eYes, install with standard flange gaskets on both faces, the same as any flanged joint. Confirm the valve's face-to-face dimension fits your flange spacing.\u003c\/p\u003e","products":[{"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 | 963004UL","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\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\u003ctd\u003e$236.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963006ul\"\u003e6 in. UL\/FM\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006UL\u003c\/td\u003e\n\u003ctd\u003e$513.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391256279:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963006UL","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-ul-fm-963004ul\"\u003e4 in. UL\/FM\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004UL\u003c\/td\u003e\n\u003ctd\u003e$236.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391223511:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$513.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963002","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\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\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963003","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963004","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963005","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963006","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963008","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963010","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963016","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-1-2-in-ductile-iron-double-door-wafer-check-valve-963025\"\u003e2-1\/2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963025\u003c\/td\u003e\n\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393976023:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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 | 963025","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\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCart\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/2-in-ductile-iron-double-door-wafer-check-valve-963002\"\u003e2 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963002\u003c\/td\u003e\n\u003ctd\u003e$70.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391289047:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003ctd\u003e$79.99\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/3-in-ductile-iron-double-door-wafer-check-valve-963003\"\u003e3 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963003\u003c\/td\u003e\n\u003ctd\u003e$106.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740391321815:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/4-in-ductile-iron-double-door-wafer-check-valve-963004\"\u003e4 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963004\u003c\/td\u003e\n\u003ctd\u003e$148.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393746647:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/5-in-ductile-iron-double-door-wafer-check-valve-963005\"\u003e5 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963005\u003c\/td\u003e\n\u003ctd\u003e$198.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393779415:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/6-in-ductile-iron-double-door-wafer-check-valve-963006\"\u003e6 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963006\u003c\/td\u003e\n\u003ctd\u003e$267.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393844951:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/8-in-ductile-iron-double-door-wafer-check-valve-963008\"\u003e8 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963008\u003c\/td\u003e\n\u003ctd\u003e$631.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393877719:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/10-in-ductile-iron-double-door-wafer-check-valve-963010\"\u003e10 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963010\u003c\/td\u003e\n\u003ctd\u003e$656.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393910487:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/products\/16-in-ductile-iron-double-door-wafer-check-valve-963016\"\u003e16 in.\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e963016\u003c\/td\u003e\n\u003ctd\u003e$3,047.99\u003c\/td\u003e\n\u003ctd\u003e\u003ca style=\"color:#FE8C03\" href=\"\/cart\/48740393943255:1\"\u003eAdd to cart\u003c\/a\u003e\u003c\/td\u003e\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\u003eAvailability\u003c\/h2\u003e\u003cp\u003eIn stock — ships direct from the manufacturer, typically 1–3 business days. Sizes in this series ship LTL freight.\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"}],"url":"https:\/\/apexflowsolutions.com\/collections\/wafer-check-valves.oembed","provider":"Apex Flow Solutions","version":"1.0","type":"link"}