Features Excellent Material - Made of stainless steel, brass and aluminum for better gas seal when working under 4500 PSI pressure. EASY FILLING - Can connect the soda maker to a 5lb, 20lb or 50lb siphon-free commercial CO2 tank with a CGA320 outlet valve. IDEAL MATCH - Also equipped with a 60 inch long hose, which allows a firm connection without leakage to greatly simplify filling. Rubber Washers: Using food grade rubber material, the washer is safe to use and will not transmit chemical taste to carbonated water. Stable at work: with corrosion resistance, high temperature ductility and low magnetic permeability to withstand up to 100℃, 212℉. Specification: Item Type: Soda Refill Adapter Material: stainless steel, brass, aluminium. Connector specifications: CGA320 Package list: 1 x Soda Charging Adapter 2 x Dust Cover 2 x large washers. 1 small washer 1 x User Manual Package List 1 x Soda Refill Adapter 2 x Dustproof Cover 2 x Large Washer 1 x Small Washer 1 x User Manual