A-B1317335GS-AI KIT-CHECK VALVEOne New Aftermarket Replacement Check Valve Kit Fits Briggs and Stratton (B&S) Pressure Washers This aftermarket replacement check valve kit fits inside the pressure washer pump head and creates the pump pressure by controlling water flow and preventing backflow. A worn or failed check valve results in loss of pressure or no pressure output from the pump. Replacing the check valve kit restores proper pump function and operating pressure. Compatible