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McDonnell & Miller model number 42S is a combination float-operated low water cut-off and pump controller for steam boilers that have a separate water column. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection.
McDonnell & Miller model number 42S-A is a combination float-operated low water cut-off and pump controller with quick hook-up fittings for steam boilers. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection.
McDonnell & Miller model number 42S-N is a combination float-operated low water cut-off and pump controller with 1/2" IP gauge glass connections for steam boilers. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection.
