Protection against the backflow of sewage and storm water;Compact, lightweight and easy to install;All Canplas Backwater valves are socket x socket with all sockets being DWV;Acme threads provide positive traction and extra strength;Neoprene O-ring effectively seals valve lid

• Canplas 223285W PVC Backwater Valve with 16-Inch Access Sleeve and ABS Lid, 4-Inch

Canplas 223285W PVC Backwater Valve with 16-Inch Access Sleeve and ABS Lid, 4-InchCanplas