The Watts USG-B-M3 3/8" Under Sink Guardian Thermostatic Mixing Valve delivers reliable point-of-use scald protection by automatically blending hot and cold water to a safe, consistent outlet temperature. Designed for under-sink installations, it helps prevent accidental burns while improving comfort and safety in residential and commercial plumbing systems. Ideal for lavatories and hand-wash sinks where temperature control is critical.