Water Pump for WEN PW31Part Number:PW31-029Horizontal Axis Pump, Pressure 3100 PSI, Flow Rate 2.5GPM, Inlet Connector NH3/4, Outlet Connector M22*1.5, Bore 14, with Thermal Control ValveFor instructions on replacing your pump, click here.Compatible with the following Model: WEN PW31 Gas Powered 3100 PSI Pressure Washer For CA residents, click here for Proposition 65 information