McDonnell & Miller 42S Controller 30067439-890 ensuring optimal heat transfer and

ensuring optimal heat transfer and preventing hotspots

ensuring the system remains hermetically tight during maintenance or extended operation

keep the container tightly sealed until use

and pool heaters with a capacity of up to 240

Broad Cross-Reference: Directly replaces obsolete part numbers 193804

McDonnell & Miller 42S Controller 30067439-890 ensuring optimal heat transfer andThe McDonnell & Miller 42S Controller (Part Number 129302) is a critical float operated combination low water cut off (LWCO) and pump controller designed for residential, commercial, and industrial steam boilers. Engineered for systems with a separate water column, this steam boiler water level control features dual SPST snap action switches that provide reliable automatic reset functionality. The 129302 pump controller handles a maximum operating