Thermostatic mixing valve... often found at water heater & ... - under sink mixing valve
Accurately adjusts, maintains and limits the hot water temperature to a desired setting selected by the user. By installing a thermostatic mixing valve and raising water heater storage temperature setting and limiting mixed outlet water temperature to safe temperature more usable hot water is available. In heating applications it provides comfort and protects the equipment.
Series 825Y reduced pressure zone assemblies are used to protect against high hazard (toxic) fluids in water services to industrial plants, hospitals, morgues, mortuaries, and chemical plants. They are also used in irrigation systems, boiler feed, water lines, and other installations requiring maximum protection.
8615510865705 
8615510865705