or low-voltage security circuits

For complex installations

it functions effectively on 2-wire systems by connecting to the RH and W terminals

providing the precision-fit bolts

Precision Control: Eliminates mechanical play in the damper linkage

McDonnell & Miller 67-G Low Water Cut Off Els PW 17895 or low-voltage security circuitsThe McDonnell & Miller 67 G is a float operated mechanical low water cut off engineered specifically for steam boilers and millivolt service applications. For contractors managing residential or commercial steam systems, this auto reset control provides critical burner protection by interrupting the millivolt burner circuit if the water level drops to a dangerous point. The unit features dual precision switches, allowing for simultaneous low water cut