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Direct OEM Compatibility: Specifically designed to replace the Lennox 12F1901 without modifications to the mounting bracket or electrical connections
only the Williams P151800 OEM gasket should be used to provide the necessary thermal resistance and thickness
Exact Compatibility: Designed for an immediate fit within the Sensus 143 series spring housing
Enhanced Compatibility: Specifically engineered to replace the legacy 5H79636 model in vintage and modern units
Common Questions: What is the primary function of a 9# crossover relay
Watts 0358550 Regulator Els PW 17895 Direct OEM Compatibility: Specifically designedWhen you are servicing high demand hydronic systems, the Watts 0358550 (Series 374A) is the industry standard for reliable overpressure protection. This 3 4 inch boiler pressure relief valve is specifically engineered for hot water heating boilers with a factory set relief pressure of 45 PSI. Designed with a robust iron body and a forged bronze inlet, it effectively manages thermal expansion in systems rated up to 875,000 BTU hr. A standout technical