S-641 - 3" Backwater Valve - PVC - Solvent

• 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 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
• Manufactured with 100% 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