GAS BOTTLE PRESSURE FLOW REGULATOR DUAL GAUGE ARGON CO2 OXYGEN ACETYLENE WELDING
Argon (Blue regulator) has flow gauge for output (see photo). Acetylene - G5/8 Male (Left hand thread). Argon - G5/8 Male (Also can be used for Nitrogen). CO2 - W21.8 Female. Welding & Cutting Machines.