Features SPECIFICATIONS: The tube has a working pressure of 1500 PSI, the pressure gauge is 3000 PSI, the thread is CGA320 for large CO2 tanks and TR21-4 for soda cans. PRESSURE GAUGE - Equipped with pressure gauge, it can clearly see the air pressure range, which is convenient for controlling the pressure within a safe range. DOUBLE VALVES: This adapter has two ON OFF valves, one to control CO2 from large to small bottle and the other to release excess gas after filling. EASY TO INSTALL - This cylinder charging adapter is compact and equipped with gaskets for easy installation, use a wrench to tighten the connector to prevent leakage. EXCELLENT METAL:The adapter hose set is made of stainless steel and brass, which is resistant to rust and corrosion, and will not deform or wear out for a long time. Specification: Item Type: CO2 Bottle Refill Adapter Material: stainless steel, brass Connector specifications: CGA320 Tube length: 36 inches. Package List: 1 x Adapter 3 x Gaskets 1 x User Manual Note: 1. Please read the instructions before use, the large CO2 tank (gas supply cylinder) should have sufficient pressure. If it is liquid CO2, flip the large tank upside down or freeze the soda bottle for a while to inflate it. If the can still does not inflate following the instructions, we recommend replacing the thin thimble can. Cannot be used in paintball CO2 tanks. Cannot be used with new CO2.2 cylinders. When the stainless steel braided tube expands, check if the vial thimble is too thick to swell. If there is, replace the thimble thin bottle and it can be used normally Package List 1 x Adapter 3 x Gaskets 1 x User Manual