... compressors from starting under load, and an auto-off disconnect lever for manual cut off the compressor. A four port manifold style is ... -1H3 Min on (cut-in) PSI 25, 35, 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30 ... -4H3 Min on (cut-in) PSI 25, 35, 50 Max off (Cut-out) PSI 100, 150, 175 Differential PSI 20-30 ...