This contractor grade Zoeller pro sump check valve prevents back flow for efficient pump operation. Connects with 1-1/4 x 1-1/2 in slip x slip union and includes 4 clamps and 2 boots. Sump pump check valve connects with 1-1/4 x 1-1/2 In. slip x slip union Includes 4 clamps and 2 boots Can be installed vertically or horizontally Prevents back flow for efficient pump operation Type: Check valve Low Pressure: N/A Material: Plastic On/Off Pressure Setting: N/A Package Contents: Pro Sump Check Valve 1-1/4 in x 1-1/2 in Package Quantity: 1 Warranty: 1-year CA Residents: Prop 65 Warning(s): Yes UNSPSC: 40151500