Miller® Smith® Medium Duty Single-Stage Argon, Ar/CO2 Mix, and Helium Flowmeter Regulator, CGA-580Miller Smith flowmeter regulator provides precise shielding gas regulation for MIG and TIG welding applications. Shatter resistant polycarbonate flow tube features triple scale for Argon, Helium and Argon CO2 and has a packless O ring flow tube seal, which reduces maintenance. Built in rupture disc reduces possibility of flow tube damage due to high pressure inlet surge. Precision flow adjustment valve locks flow at desired setting.