These valves are designed to control the mixing of hot and cold water and deliver it at a constant, pre-set temperature. The valve is equipped with a union end, loose key, angle stop, check valves with built-in strainers and vacuum breaker; Control valve is set to deliver water at temperatures up to 115 degrees Fahrenheit. Failure of the cold water supply will cause the hot water supply to close, eliminating any possibility of scalding; recommended for use on stationary models