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Product Description
The S-640 backwater PVC valve is in solvent x solvent configuration. The stepped body design places the inlet socket-end higher than the outlet, promoting the correct drop-per-foot and improving flow efficiency. The lid and flapper are equipped with o-rings assuring a positive seal-out of sewer gasses. Designed for horizontally-installed, low pressure gravity-flow DWV systems only, not suitable for upward-flow or pressurized systems.