Oatey 43905 Backwater Valve, 6 in H, ABSOatey backwater valves are designed as a sewage check valve to prevent pumped water from flowing back into the basin. Assembly includes threaded cover to allow for access and a valve flapper which seals closed while not in use. Made of PVC or ABS plastic, backwater valve can be solvent welded to piping. Oatey backwater valves can accommodate access sleeves made of schedule 40 pipe. Unit: EA UPC: 038753439051 Model Number: 43905