Legend Valve 202-253 S-640 Neoprene Backwater Valve, 3"

3" Backwater Valve. 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" x 4" 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. Manufactured with 100 percent virgin resins; No re-grind. Designed for horizontally-installed, low-or-no pressure gravity-flow DWV systems only. Not suitable for upward-flow vertical installations or pressurized systems.