McDonnell & Miller 172809 150S-M-HD Head Mechanism Manual Reset
McDonnell & Miller model number 150S-M-HD is a head mechanism for model number 150S-M and 157S-M 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.

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