521509A - MixCal Adjustable Thermostatic Mixing Valve - 3/4" SweatCaleffi 521509A 3 4" MixCal Adjustable Thermostatic Mixing Valve 3 4" Sweat For point of distribution in domestic water systems and radiant hydronic heating systems. The Caleffi MixCal 521 series three way thermostatic mixing valve is used in systems producing domestic hot water or in hydronic and radiant heating systems. It maintains the desired output temperature of the mixed water supplied at a constant set value compensating for both temperature
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