The Karcher 4.580-358.0 Thermo Valve Assembly helps regulate temperature to protect pressure washer components during operation. This assembly is designed to monitor water temperature within the system and release overheated water when necessary, preventing internal damage. It works by opening at a preset temperature, allowing hot water to exit and cooler water to circulate through th... https://www.wholetoolbox.com/karcher-4-580-358-0-thermo-valve-assembly