Regulator - Model No: 21905 Flow: 10 GPM @ 2000 PSI Temp: 160 Degrees F Inlet: 3/8" FNPT Bypass: 3/8" FNPT Weight: 12.5 oz. Regulator - Model No: 21905F Flow: 10 GPM @ 2000 PSI Temp: 160 Degrees F Inlet/Discharge: 3/8" FNPT Bypass: 3/8" FNPT Weight: 13 oz.