Backwater Flapper Check Valve, Series/Model: Model S-640, Nominal Size: 2 IN, Connection Type: Socket End, SCH 40 Pressure Class, PVC Body Material, Seal Material: Neoprene, Material Standard: Body And Flapper: ASTM D1784, Industry Standards: ISO 9002, 4-1/2 IN Width, 3.88 IN Height, Lead Free: No

• The stepped body design places the inlet socket-end higher than the outlet, promoting the correct drop-per-foot and improving flow efficiency
• Heavy-duty Acme-threaded access lid can be removed using the end of a dimensional 2 IN x 4 IN board of correct length, to ease clean-out or repair
• Lid and flapper are equipped with an o-ring or gasket seal, assuring a positive seal-out of sewer gasses
• Designed for horizontally-installed, low-or-no pressure gravity-flow DWV systems only
• Not suitable for upward-flow vertical installations or pressurized systems
• Nominal sizes 3 IN, 4 IN and 6 IN only

• Brochure/Catalog https://www.macombgroup.com//ASSETS/DOCUMENTS/ITEMS/EN/050PVSBVL_Broc.pdf
• Submittal Sheet https://www.macombgroup.com//ASSETS/DOCUMENTS/ITEMS/EN/Legend_202-252_Submittal_Sheet.pdf