The McDonnell & Miller 750-HW-MT-120 (Part Number 176236) is a heavy-duty 120Vac high water cut-off designed to provide failsafe protection for steam boilers and hot water heating systems

Key Benefits Corrosion Protection: Imblue Technology provides a high-durability finish for superior performance in outdoor or coastal environments

though you should always verify specific local code requirements for your installation

it integrates seamlessly into existing HVACR and pneumatic systems

suitable for low-pressure steam and water applications

McQuay 071278401 GAS VALVE R-410A The McDonnell & Miller 750-HW-MT-120The McQuay 071278401 GAS VALVE is a high precision fuel regulation component engineered for specific McQuay and Daikin Applied rooftop units and commercial furnaces. As a redundant gas valve, it features dual solenoid seats to ensure a positive shut off and meet stringent safety standards for industrial heating applications. Designed for seamless integration with 24V HVAC control circuits, this valve is a direct OEM spec replacement for the Daikin