Quick Mixing Valve Kit f/Nautic Boiler B3 Thermostatic. 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. Specifications for Quick Thermostatic Mixing Valve Kit f/Nautic Boiler B3: Manufacturer: Quick Color: Black Package Contents: Quick Thermostatic Mixing Valve Kit f/Nautic Boiler B3 Quick FLKMT0000000A00: Mixing Valve Kit f/Nautic Boiler B3 Thermostatic