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Why is this item non-returnable
or carbon buildup in the heat exchanger causing pressure fluctuations
and RTH systems
71 IWC to meet strict furnace safety standards and prevent nuisance trips
Watts 0386421 Regulator Valve Els PW 17895 Why is this item non-returnableProfessionals in the field recognize the Watts 0386421 (Model TB1156F) as a high capacity industry standard for hydronic heating systems. This 1 2 inch feed water pressure regulator is engineered to maintain consistent system pressure by automatically filling the boiler and piping. It serves as a drop in 0386500 replacement and is the direct successor to the legacy T1156F valve. Designed for rugged commercial and residential use, the Watts 0386421
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