Booster Regulator Air Inlet Size 1/4 in Air Inlet Type NPTF Maximum Flow Rate 8.1 scfm Maximum Operating Pressure 290 psi Maximum Operating Temperature 122 Degrees F Pressure Boost Ratio 2 Includes 2X Pressure Increased Ratio with Gauge PSI Handle-Operated Air Outlet Size 1/4 in Air Outlet Type NPTF Minimum Operating Pressure 29 psi Minimum Operating Temperature 35 Degrees F