This P70 Series of controls employs a set of switch contacts that are opened and closed by the movement of pressure actuated bellows. The load-carrying contacts provide direct control of AC motors within the control rating. Note the electrical rating chart for specific models. These controls are available with either close high-open low, open high-close low, or SPDT contact action. Product Specifications BRANDJohnson Controls MAXIMUM BELLOWS OVERRUN PRESSURE PSIG (KPA)325 (2241) PSIG (KPA) RANGE20 in. to 100 (-68 to 690) DIFFERENTIAL PSI (KPA)Min 7 (48) Max 50 (345) SWITCH ACTIONOpen High - Close Low PRESSURE CONNECTOR1/4 in. Female NPT LIMITED WARRANTY YEARS1