GOCHANGE CGA580 Mig/Tig Flow Meter Regulator, Argon Pressure Reducer Gauge Weld Flowmeter - Full Copper - 10 to 60 cfh The pressure gauge which shows how much gas is left in the tank goes from 0 to 4000 psi. This flowmeter does not use a diaphragm, so it is more reliable than the flow-gauge style regulators. The output flow is adjustable from 10 to 60 cfh (cubic feet per hour), and is indicated by a ball which moves up and down in the flow tube, so this flowmeter will handle MIG and TIG welding both steel and aluminum. Outlet of the Flowmeter will fit both the female 9/16" x 18 nut or the male 5/8" x 18 fitting. It comes with a standard 1/4" barbed fitting; Inlet connection: CGA580