Industrial Grade Insulation: Designed to withstand the thermal stress of continuous flue gas extraction

while the NBR (Nitrile) seals offer excellent compatibility with liquefied petroleum gases

making it ideal for managing compressor cycling

Superior Insulation: The 7mm silicone jacket provides high-temperature protection and prevents arcing in tight mechanical clearances

the included ceramic wire nuts allow for a professional cut-and-strip connection to legacy harnesses

McDonnell & Miller 61-HD Low Water Cut Off Refrigerant Industrial Grade Insulation: Designed toThe McDonnell & Miller 61 HD (Part Number 140300) is a heavy duty mechanical low water cut off designed specifically for low pressure steam boiler applications. This head mechanism serves as a direct replacement component for Series 61 controllers, facilitating reliable burner circuit interruption when water levels drop below the safe line. Rated for a maximum steam pressure of 20 PSI, the 61 HD utilizes a high buoyancy float operated mechanism to