House Diaphragm Pressure Switch provides an ideal solution for pressure control applications, requiring tamper proof external adjustment and environments which require water-tight NEMA 4 housings. The Pressure Switch is available in single or dual control settings for both positive pressure and vacuum models, to 150 PSI. The House Diaphragm Pressure Switch can be wired in normally open or normally closed type pattern through a ¾"-14 NPT conduit connector to free leads to 18". House Diaphragm Pressure Switch features self-locking set screw adjustment and dials which are calibrated for increasing setting.