✅This Gas regulator is designed for Professional TIG/MIG Welding Applications.
✅CGA - 580 Connection for Argon/CO2Tanks.
✅The Square flow tube reads from 0 - 25 LPM, which is indicated by a ball which moves up and down in the flow tube.
✅Large diameter pressure gauge which reads from 0 - 3500 PSI. Easy to read accurately.
✅High density filter screen,effectively filter gas impurities.
✅High-pressure exhausted valve design,safe is use.
Introduction:
Color: Gold 
Material: Copper 
Size: 12cm(L)*7.5cm(W)*16CM(H) 
Compare the detail sizes with yours,please allow 1-2MM differs due to manual measurement. 
Flow Meters are moreaccurate than the flow gauge regulators.
Featuresand Instructions: 
The pressure gauge which shows how much gas is left in the tank goes from 0 to 3500 psi. The output flow is adjustable from 0- to 25lpm, and is indicated by a ball which moves up and down in the flow tube, sothis flow meter will handle MIG and TIG welding both steel and aluminum. The fitting is a CGA - 580 Connection. A very nice thing about this Flow meter is the outlet will fit both the female 9/16" x 18 nut or the male 5/8" x18 fitting. You can see the adapter in the picture. It comes with a standard1/4" 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 the5/8" x 18 male nut.