When should the cover gaskets be replaced

Is this a direct replacement for the 5H54751-40

the "HH" style core version is often preferred by technicians for higher acid and wax removal

a new seat is required to restore the seal

including the 47-102077-02 and 47-102077-05 models

Weil McLain 510-312-167 Transformer 30067439-890 When should the cover gasketsThe Weil McLain 510 312 167 is a mission critical combination transformer and DPST relay assembly designed for seamless integration into Weil McLain boiler control circuits. This factory spec component serves as a robust 120 24 volt step down transformer, providing a consistent 40 VA power rating to drive low voltage ignition systems, zone valves, and auxiliary controls. Engineered for high demand hydronic environments, the 510 312 167 relay assembly