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Complete 9-Piece Set: Provides all necessary 3/4 inch ID gaskets for a full header service in one package
replacing HH12ZA178 and HH12ZA178A exactly
and 1611 pump models
ensuring system pressures equalize before the next start cycle
312 inches before installation
Watts 0342691 Relief Valve Complete 9-Piece Set: Provides allThe Watts 0342691 (Model 335M2) is a high capacity boiler pressure relief valve engineered for hydronic heating systems and low pressure steam applications. Featuring a 3 4" female NPT inlet and 3 4" female NPT outlet, this ASME Section IV rated safety valve is factory set to 30 PSI, providing critical overpressure protection for residential and light commercial boilers. With a steam discharge capacity of 510,000 BTU hr, it serves as the direct
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