... are used to regulate the tank pressure between two preset values on small (up to 175psi) ... Metallic Cover . No Wire Looping - Visible Contact - No Drift Pressure Setting - Captive Cover Screw - Ample Wiring Room - 2 Ground ... (cut-in) PSI 25, 35, 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30, 30-40 ... (cut-in) PSI 25, 35, 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30, 30-40 ...