The McDonnell & Miller 64 (Part Number 143600) is a heavy-duty mechanical low water cut-off engineered for reliable water level regulation in residential and commercial hot water and steam boilers

allowing technicians to establish a precise adjustable deadband for complex control circuits

Its pilot piston design ensures consistent actuation and tight shut-off

including chlorine and bromine

the SGP series is rated for high-pressure applications

Belimo EFB24 Actuator 30067439-890 The McDonnell & Miller 64The Belimo EFB24 is a heavy duty spring return actuator engineered for on off control in high torque HVAC applications. Delivering 270 in lb of torque, this unit is designed to automate large control dampers and specialized valve assemblies. Operating on 24VAC DC, the EFB24 utilizes a mechanical spring return system to ensure a defined fail safe position during power loss, providing critical protection for air handling units and industrial ventilation