45-degree flare connections rely on a metal-to-metal seal

While cleaning with a fine abrasive may temporarily restore the microamp signal

Always verify the fuel type before installation

Does the 309868755 include the required gaskets

McDonnell & Miller 157S-R-M Pump Controller R-410A 45-degree flare connections rely onThe 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