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McDonnell & Miller General Catalogue Industrial Controls

McDonnell & Miller Series 42S Combination Low Water Cut-Off / Pump Controllers

• For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column
• For boilers of any steaming capacity
• Monel bellows provides corrosion resistance
• Single pole, single throw snap action switches
• Enclosed junction box protects switches
• Optional features
– Quick hook-up fittings
– Gauge glass connector
• Maximum pressure 50 psi (3.5 kg/cm2)

The McDonnell & Miller Series 42S provide continuous protection against a low water condition. Furthermore it satisfies pump control needs for commercial and industrial steam boilers.

If you need a different model other than those listed, please contact us at

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