Take some pressure off your power washing pump with Comet's Universal Pressure Washer Thermal Relief Valve. This thermal relief valve is designed to open and release hot water and allow cold water to enter the pressure washing pump; making the pump continue to operate at a safe temperature. With a 3/8” MNPT connection, easily Installs onto a pressure washer pump. Handles up to 200 PSI. Made of all-brass construction for increased durability to withstand high pressure and harsh weather elements. Compatible with Comet, AR North America, General and other branded pressure washing pumps.