The 131 series 3/8" (10mm) compression fitting thermostatic mixing valves maintain and limit hot water to a desired selectable temperature between 80°F and 120°F. Incorporates dual check valves to protect against cross-flow and integral screen to filter out debris. A thermostatic mixing valve is intended for under-sink installation to control the hot water temperature and prevent accidental scalding. The water temperature must be adjusted by the installer using a thermometer to measure the hot water temperature at the faucet outlet. Maximum temperature of 110°F is recommended.