CO2 Flowmeter Regulator Gauge Carbon Dioxide Meter 0-25LPM CGA 320 Fitting Output Flow: Adjustable From 0 To 25 LPM Measured By A Steel Ball Going Up And Down In Flow Tube 0-25 LPM EQUAL TO 0-60 CFH Fitting Size: CGA-320 Durable Long Lasting Brass Body Compatible With Any Co2 Tank With A CGA-320 Valve And Measures PSI