Dixon R73G-3RG Norgren Series Regulator with Gauge, 3/8" Size, 144 SCFM, 3/8" Port Size, 5-150 PSI Supplied with GC230 gauge Relieving type 5-150 PSI range 3/8" Port size Inlet pressure: 300 PSI at ambient temperature (70 degree F) Maximum Temperature : 150 degree Fahrenheit