The P170 Series of controls employ a set of SPST contacts that are opened and closed from the movement of pressure actuated bellows. The load-carrying contacts provide direct control of the AC motor within the control's electrical rating. Product Specifications BRANDJohnson Controls MAX OPERATING PRESSURE (PSI)525 psig (3620 kPa) PSIG (KPA) RANGE50 to 500 (345 to 3448) SWITCH ACTION4 - wire - 2 - circuit - Line - M1 Close - high - Line - M2 Open - high PRESSURE CONNECTOR1/4 in. Male Flare Connector TYPEManual Reset Lockout LIMITED WARRANTY YEARS1