US Warehouse - FREE FAST Shipping in USA Product Description: Fitting: 1/4" NPT. The outside diameter of male thread is 1/2 inch. Include 2 pieces pressure washer release valve. Compatible with many brands, such as Generac,Homelite, Karcher, Briggs, Power Stroke, Husky, Black Max, Craftsman, Him Ore and Ridged pressure washers. Replaces Homelite part numbers 678169004, 678169002 and 678169001. Replaces Briggs and Stratton parts 208673GS, 21783GS, 194298GS and B3090GS. Thermal Relief Valve protects pressure washer pumps operating in a safe temperature range to prevent overheating. When water temperature reaches above 145º F, pump seals may fail. The thermal relief valve will open to release hot water and allow cold water to enter the pump. So it continues to operate at a safe temperature. If the pump have ever overheated, the thermal relief valve must be replaced. Made of brass. Max. inlet pressure of pumps is 200 PSI. Quick reply within 10 hours. Any issue or question, please free to contact with us. Thank You for Shopping!