Jones Stephens™ B04400K 4 in Backwater Valve

Reduces backflow in drainage system Sockets are SCH 40/STD DWV Threaded access cover for easy inspection Magnetic strip for underground detection Flapper and cover have elastomeric gasket to ensure watertight seal Stepped construction encourages flow (minimum 1/4 in per foot fall) Extension kit includes 16 in sleeve, adapter and plastic lid