McDonnell & Miller 42S Boiler Low Water Cut-Off/Pump ControllerThe McDonnell & Miller 42S Boiler Low Water Cut Off Pump Controller is a trusted boiler low water cutoff and pump controller designed to protect boilers from dry firing and brittle operation. This versatile unit combines protective low water control with pump management for steam and water media across residential, commercial, and industrial applications. It features a 1 inch threaded port for easy integration, a SPST snap action switch for precise

delivering a reliable upgrade for Carrier furnaces and keeping your heating system running smoothly

durable electrical switch

with a rating from -40 to 250 Deg F

Direct OEM replacement for Lennox 18G90 parts

Diameter: 4

Its rugged construction handles temperatures from -40 to 175 °F and provides a 1/2 PSI pressure rating

Water Heater Gas Valve

microprocessor-based design

Type: Coalescing

This Direct Acting (Heating) and Reverse Acting (Cooling) model uses a pilot-bleed mechanism for stable operation and a single temperature setting

Electronic actuation: precise

this switch ensures precise control of system modes with smooth