3" PVC Backwater Valve with Extension Kit and Cast Iron Lid 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) NSF and UPC approved Factory direct If you are not satisfied for any reason products may be returned within 30 days of shipment for a credit or exchange (provided the product is undamaged), except where noted, NOT RETURNABLE. Return documentation should clearly specify credit or exchange. Returned items must be in the original packaging. All returns must include a return authorization (RGA) number that can be obtained by contacting our Customer Service Department. Original shipping cost deducted. Reference to brand names and numbers are for reference only, and not meant to imply that they are made by that manufacturer (OEM). Sometimes images shown are generic and not meant to infer that they are actual. The parts will work as intended and are high quality and precision tested. Track Page Views With Auctiva's FREE Counter