High Quality Argon, CO2, Oxygen, Acetylene, Regulator Made From Precision Instru Fits Standard Cga 580 Argon Tank (co2 Adapter Requried For co2 Tanks Not Include Easily Adjust Your Gas Flow Rate With The Built In Flow Meter. The Flow Meter Measures Gas Flow in Liters Per Minute (L/min) up to 25L/min