CGA-320 to CGA-580 Adapter # 806 CO2 Carbon Dioxide Bottle to Argon Flowmeter MPN: A-809 Details • CGA-320 x CGA-580 • Used to connect an Argon flowmeter to a CO2 tank • Includes 1 Adapter & 1 Nylon Washer • Solid Brass Switch to WAYYY cheaper CO2 for your mig welding shielding gas. Especially suited for modern inverter type Mig welders. Price is FIRM @ $15