The plated housing contains a diaphragm, a calibration spring and a snap-acting SPDT switch.
The sample connection located on the low pressure side of the diaphragm accepts 1⁄8″ pipe. The sample connection located on the high pressure side of the diaphragm accepts 1⁄4″ pipe.
An enclosure cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw. The enclosure cover accepts a 1⁄2″ conduit connection.