... are used to regulate the tank pressure between two preset values on small (up to ... Metallic Cover . No Wire Looping - Visible Contact - No Drift Pressure Setting - Captive Cover Screw - Ample Wiring Room - 2 Ground ... 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30, 30-40, 35-55 Factory setting PSI ... 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30, 30-40, 35-55 Factory setting ...