McDonnell & Miller 51-S-2-HD Cut Off R-410A Key Benefits Broad Compatibility: Directly

Key Benefits Broad Compatibility: Directly replaces various standing pilot components and is interchangeable with many OEM gas burner thermocouples

What boiler models are compatible with the 340-004-605 port

000 cycle minimum lifespan at 0

The enclosure includes 1/2 inch conduit access to protect the screw-type terminals

Key Benefits Direct OEM Match: Engineered to original factory specifications for precise resistance-to-temperature calibration

McDonnell & Miller 51-S-2-HD Cut Off R-410A Key Benefits Broad Compatibility: DirectlyThe McDonnell & Miller 51 S 2 HD (Part Number 136200) serves as a heavy duty head mechanism only for professional grade water level control. Engineered for high capacity low pressure steam and hot water boiler systems, this unit integrates a mechanical water feeder with a low water cut off (LWCO) function via a built in Snap Acting SPDT switch (No. 2 Switch). It is designed to handle a maximum vessel pressure of 35 PSI and an inlet water supply up to