The Viking Model G-1 Maintenance Air Compressor is an electric motor-driven, aircooled, single-stage, oil-less compressor. The unit is equipped with a check valve and provides a regulated (by pressure switch setting) and restricted (60 Cycle - 3.03 SCFM average free air from 0 to 40 psi gauge) or (50 Cycle - 2.50 SCFM average free air from 0 to 40 psi gauge) air supply. A pressure relief valve is factory installed to preven pressurizing the system piping above 75 PSI (5.2 bar). The Model G-1 is for use when system pressures are required to be over 20 PSI (1.0 bar).