Specifics and features: Inlet Connectors, (Tank Connectors): Oxygen CGA-540 / Acetylene CGA-510 Oulet Connectors, (Hose Connectors): 9/16" - 18 R&L Type B-B Uses: Oxy-Fuel Welding/Oxy-Fuel Cutting Medium to Heavy Duty Regulators - Body: Forged brass, Bonnet: Powder Coated, UV resistant Code Color Composite Knob Package includes: 1 × Oxygen (CGA-540)Regulators 1 × Acetylene (CGA-510) Regulators .