ANSI standard Z358.1/1998-compliant Series TM-500 includes locked temperature setting, supply check, and stop valves along with outlet temperature gauge. Available in 3/4 in. size, mixing valve system is powered by bimetal Dura-trol thermostat, which is immune to rupture or fatigue. Automatic bypass lets unit pass cold water to multiple eye- or face-washers in case hot water supply fails. Redundant thermostatic control is optional.