McDonnell & Miller 63-M Low Water Cut Off Refrigerant Improved Performance: Restores the valve's

Improved Performance: Restores the valve's original "metallic click" and tight sealing to prevent hazardous leaks

This differential pressure switch acts as an air proving switch

Versatile Electrical Logic: The SPDT contact arrangement supports both system shutdown and remote alarm notification

featuring an outer circumference of 46 inches and a top width of 1/2 inch (A-section)

this specific kit includes the essential defrost control sensor/limit switch required for accurate temperature monitoring

McDonnell & Miller 63-M Low Water Cut Off Refrigerant Improved Performance: Restores the valve'sThe McDonnell & Miller 63 M (Part Number 143100) is a heavy duty, float operated mechanical low water cut off designed for superior reliability in both hot water and steam boiler applications. Built for contractors who require a dependable safety interface, this unit features a manual reset mechanism and a robust No. 2 dual switch assembly. These switches provide simultaneous low water cut off protection and a dedicated circuit for an electric water