Description: 【Easy to Use】: This CO2 Cylinder Refill Adapter is simple to use. First, screw the adapter onto a commercial CO2 cylinder, then attach an empty soda bottle to the adapter. Open the valve of the large cylinder and wait for about 15-20 seconds until the steel bottle is fully charged. Close the valve, release any remaining gas through the exhaust screw, and check your refill adapter. 【Secure Measures】: When using this product, ensure that the sealing device is in its correct place. Upon receiving your soda bottle refill adapter, make sure it's used on its correct side with proper sealing. 【Correct Placement】: The CO2 large cylinder can only be installed on side of this device, make sure you place your soda bottle into its hexagonal side. 【Material】: Made from sturdy brass material, this refill adapter is designed for long term use. 【Compatibility】: This Bottle Connector features a Type 2 thread (outlet valve diameter 22mm) and for W21.8 CO2 tank valves. Specification: Material: Brass Size Chart:length 90cm/35.43inch Package Includes: 1 CO2 Cylinder Refill Adapter Hose Note: Please allow slightly errors 1-2cm differences due to manual measurement.