McDonnell & Miller 157S-R-M Pump Controller 30067439-890 the nitrile (NBR) seals provide

the nitrile (NBR) seals provide a tight shut-off and prevent internal leakage

Precision Fit: Specifically machined components for ASCO 8302 series to eliminate bypass leakage

This "short cycling" is frequently caused by a dirty or failing furnace flame sensor that cannot maintain a consistent signal to the control board

Featuring a DPST (Double-Pole Single-Throw) switch mechanism

high-cycling component that stands up to the demands of air-cooled condenser and compressor management

McDonnell & Miller 157S-R-M Pump Controller 30067439-890 the nitrile (NBR) seals provideThe McDonnell & Miller 157S R M (Part Number 177306) is a heavy duty, float operated low water cut off and pump controller designed for commercial and industrial steam boilers. This unit features an integral water column and alternate tappings to simplify installation on various boiler configurations. The 157S R M is functionally identical to the 172817, utilizing a snap acting SPDT switch that eliminates the need for mercury while providing reliable