ARCCAPTAIN High-Precision Dual-Gas Regulator for Argon, Helium & CO2 Tanks. Output Flow Range: 0 - 30 CFH (Argon) / 0 - 20 CFH (Carbon Dioxide). This professional-grade gas pressure regulator is designed for versatile use withargon, helium, and carbon dioxide (CO2) cylinders, making it an...