McDonnell & Miller #173103 150S-MD-HD Head Mechanism w/ Maximum Differential

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About this part

The 150S-MD-HD is a replacement head mechanism for McDonnell & Miller Series 150S low water cut-off and pump controllers used on steam boilers. It provides factory settings with a larger differential between pump on and burner off to reduce nuisance shutdowns. All head mechanisms are interchangeable across compatible bodies without requiring full control replacement.

Replacement head mechanism for Series 150S low water cut-off/pump controllers
150S-HD with maximum differential for boiler operating pressure under 50 psi
Weight: 11.0 lbs (5.0 kg)
Interchangeable with any Series 150/150S/157/157S float chamber or water column body