General Pump / Interpump K1 (ZK1 GP) flow activated unloader valve

PA TD1 double nozzle holder

If the hole is on the arm opposite the pump outlet near the brass unloader valve you have the EZ pump

Suttner model ST-6 2 wire flow switch

Comet Pump Ceramic Piston Repair Kits features_high-limit-thermostat General Pump / Interpump K1Comet Pump complete ceramic piston kits replace all three pistons. Order one kit per pump. IMPORTANT: Incorrect installation of pressure washer repair parts has the potential to cause premature pump failure. Professional installation is highly recommended. Pump repair parts are considered wear items and cannot be returned if package is opened.