McDonnell & Miller 6667 Control R-410A 018-inch orifice matches the requirements

018-inch orifice matches the requirements of your conversion kit or the specific appliance rating plate

Normally Closed Logic: Ensures positive system isolation during power loss or thermostat cycles

this housing supports the draft inducer motor and blower wheel

The Class 2 rating ensures the device meets strict safety standards for limiting energy output

McDonnell & Miller 6667 Control R-410A 018-inch orifice matches the requirementsThe McDonnell & Miller 6667 (Part Number 153825) serves as a critical mechanical low water cut off head mechanism specifically engineered for steam boiler safety. Designed for systems with a maximum steam pressure of 20 PSI, this replacement unit ensures reliable burner circuit interruption if water levels drop below the safe operating line. As a float operated control, it utilizes a manual reset functionality, which is essential for compliance in