... Tig Mig Welding CO2 Air Inert 2.High quality, solid-brass body 3.Accurate, adjustable New Argon Gas Regulator Tig Mig ... Welding CO2 Air Inert 1. Suitable for use with argon, argon mix, air, inert gas, CO2, , helium, ... hydrogen, nitrogen & many other gas types depending on your tank threading2. Heavy-duty ...