The McDonnell & Miller 312200 Gasket is a critical replacement valve bracket gasket engineered specifically for Series 21

the TOOL-82 is built to withstand the rigors of a contractor’s daily carry

the inclusion of ceramic wire nuts allows for safe cut-and-strip installation if the factory plug does not match

the sensor is housed in a NEMA 1 galvanized steel enclosure

Armstrong Furnace R42936-001 Discharge Thermostat The McDonnell & Miller 312200The Armstrong Furnace R42936 001 Discharge Thermostat is a critical high limit safety component engineered specifically for HVAC discharge temperature monitoring. Designed to integrate seamlessly with Armstrong and AirEase furnace models, this limit switch monitors heat exchanger temperatures to prevent thermal runaway. When discharge temperatures exceed factory set parameters, the R42936 001 interrupts the heating circuit, protecting the heat