Merrill Manufacturing’s new control switch’s design combines a heavy-duty pressure switch and pump control box into one piece.  It is individually boxed with a captive nut on the cover. Adjustment instructions are located inside the top cover and each turn of the adjustment screw is 2 psi. Contact points open on cut-out or high-pressure switch off, and points close on cut-in or low-pressure switch on. Custom molded name on cover is available.