McDonnell Miller (173502) 157S Low Water Cut-Off & Pump Controller

Model number 157S is a combination float-operated low water cut-off and pump controller for steam boilers with an integral water column. The controller has 1/2" NPT tappings for gauge glass and tri-cocks. This control features an automatic reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 150 psi and it has a tapped 1" FIP connection.

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