Jones Stephens 4" PVC Backwater Valve

Sockets are Schedule 40 DWV Reduces backflow in drainage system 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" per foot fall) The 1-1/2", 2" and 6" have UPC, SBCCI and CSA approvals The 3" and 4" are NSF approved and UPC approved!