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coupled with a stainless steel ball and stem
With a compact open board with standoffs configuration
it fits many systems requiring a 24V AC coil relay with similar terminal configurations
This model is the direct replacement actuator for several legacy units
McDonnell & Miller 157S-R Controller THPU32HP7Y coupled with a stainless steelThe McDonnell & Miller 157S R (Part Number 176220) is a heavy duty, float operated combination low water cut off and pump controller designed specifically for steam boilers with an integral water column. This model serves as the upgraded direct replacement for the McDonnell & Miller 157 R, transitioning from older mercury switch technology to reliable, bimetal snap acting switches for enhanced safety and modern compliance. Built with a corrosion