Backwater Valve; Type Stepped; Applicable Standard UPC, NSF; Pipe Size 4"; Top Size 8"; Overall Dimensions 9-3/8" Length x 6 3/4" Height; Cover Type Threaded; Body Material PVC; Inclusions/Features Reduces Backflow in Drainage System, Flapper and Cover Have Elastomeric Gasket, Extension Kit, Cast Iron Lid; Packaging Quantity 1 per Carton