Jones Stephens B05400 4 ABS BACKWATER Valve

Amazon.com Price: $65.48 (as of 02/01/2024 23:58 PST- Details)

Reduces backflow in drainage system; Sockets are Schedule 40 DWV
Threaded access cover for easy inspection; Magnetic strip for underground detection
Flapper and cover have elastomeric gasket to ensure watertight seal