McDonnell Miller (135100) 51-2-HD Head Mechanism for Series 51-2Model number 51 2 HD is a head mechanism for model number 51 2 controls. Head mechanisms include everything except a float chamber. They allow for quick and easy replacement by removing the bolts on the float chamber and then removing and replacing the new unit, with no need to disrupt piping. Part Number : 135100 Model: 51 2 HD Details: Mechanical water feeder & low water cut off Head mechanism only Connection type: screwed Connection size: 1"

This patented technology provides the best protection without turning off the burner unless there is a low water condition

United Brass Works (198523) Spring Check Valve - 50T - 1 1/4”

Direct mounting eliminates need for equalizing connections

Body tappings: Female inlet

1°F (Valve Housing Sensor)

Large float chamber

or those requiring a water-tight

Model number 63 is a float-operated low water cut-off for steam or hot water boilers

Thermolec B-5

Prevents over- and under-heating

3″ and 6″ (25

Angle Valve not for use in water systems intended for human consumption