Brand new in the box SPARC regulator / flow meter combos. Great for MIG and TIG welding. *CGA580 Bottle Inlet Connection – Fits standard argon, helium, nitrogen, and argon/CO2 style gas bottles from any supplier *Adjustable output flow is from 10 to 60 cfh (cubic feet per hour) at a preset 50psi, 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. Scales on flow tube are ONLY scaled for CO2 and argon. *Outlet will fit both the female 9/16" x 18 nut or the male 5/8" x 18 fitting. You can see the adapter in the picture. It also comes with a standard 1/4" barbed fitting. If you have a Miller, Lincoln, or Hobart welder, the gas hose from your machine should screw right in, as they should use the 5/8" x 18 male nut. *There are NO GASKETS or WASHERS to get the fittings to seal like other cheaper regulators sold here on Amazon that do not use the standard N-24 nut and NP-72 outlet nipples. *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. Package Includes: (1) Flow Meter (1) Set of adapter fittings. 1 Year Warranty against manufacturing defects!