McDonnell & Miller 51-S-2 Switch R-22 utilizing a genuine Lochinvar rubber

utilizing a genuine Lochinvar rubber door gasket ensures the unit meets its original factory specifications for airflow and thermal containment

Can this switch be used for sensing combustible gases

If the inducer fails to reach target RPM

This OEM Rheem replacement part is calibrated with a 285°F temperature rating

Engineered for high-performance HVAC platforms

McDonnell & Miller 51-S-2 Switch R-22 utilizing a genuine Lochinvar rubberThe McDonnell & Miller 51 S 2 is a heavy duty mechanical water feeder and low water cut off (LWCO) designed for low pressure steam and hot water boilers. Engineered for systems with a maximum vessel pressure of 35 psi, this unit features a snap acting SPDT switch that ensures positive electrical contact for burner control or alarm signaling. The 1" NPT connections allow for straightforward integration into existing boiler piping, providing a reliable