Pressure washer check valves let enough water flow through the pump and manifold to pressurize the water at the nozzle. If the pressure washer check valves are damaged, the pump won’t build pressure. Air in the inlet water supply can damage the pressure washer check valves, as can chemical residue left in the pump. Replace damaged check valves by installing a manufacturer-approved pressure washer check valve kit, following the steps in this repair guide.
Use this guide to install the pressure washer check valve kit in Craftsman, Generac, Briggs & Stratton, Snapper, Husqvarna and Troybilt pressure models.