Feature: 1. Good sealing performance, no gas leakage when connected to the cylinder, more convenient to use. 2. The connector can easily inject carbon dioxide into the water bottle, which is simple in operation and practical. 3. Made of high quality brass material, it is durable, wear-resistant and can be used for a long time. 4. It is a very practical accessory with exquisite workmanship and excellent performance. 5. It can be used with large CO2 tank with CGA320 connector, or DIN477 / W21.8-14 connector, JIS m22-14 CO2 tank valve. Specification: Condition: 100% Brand New Item Type: CO2 Refill Adapter Material: Brass Type: W21.8 to TR21.4, CGA320 to TR21.4 (Optional) Weight: Approx. 167g / 5.9oz Height: Approx. 4.7cm / 1.9in Operating Instructions: 1. Screw the adapter onto the commercial carbon dioxide cylinder 2. Screw CO2 of air cylinder into adapter 3. Open the atmospheric bottle valve 4. After about 15 to 20 seconds, the cylinder is full 5. Close the atmospheric bottle valve 6. Open the vent screw to discharge the residual gas. 7. Remove the carbon dioxide produced by the cartridge Package List: 1 x CO2 Refill Adapter3 x Gasket Note: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.