Thermostatic Mixing Valve Kit for Nautic Boiler B3A thermostatic mixing valve is a valve that blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures, preventing scalding. The Quick thermostatic mixing valve is suited perfectly for the Quick and Sigmar brand of water heaters. This kit is sold complete with the valve, hose , and fittings.For use with Quick Nautic Boiler B3.