Features: 1With two on/off valves suitable for CGA320 connector CO2 cylinder. 2Made of high quality brass material corrosion resistant and durable. 3The size is precise easy to install and use suitable for SodaStream. 4Excellent performance and high reliability ensuring long service life. 5Soda accessory with exquisite workmanship which is reliable to use. Specification: Condition: 100% Brand NewItem Type: CO2 Refill AdapterMaterial: BrassThread Size: TR21-4 / G1/2Length (Exclude the Valve): Approx. 17cm / 6.7inWeight: Approx. 426g / 15ozHow It Works:1. Screw the adapter onto a commercial CO2 gas cylinder.2. Screw the empty CO2 cylinder into the on / off and then into the adapter.3. Open the valve of the large cylinder.4. After about 15-20 seconds the cylinder is completely filled.5. Close the valve of the large cylinder.6. Open the screw of the exhaust valve to exhaust the remaining gas.7. Unscrew the carbon dioxide cylinder-complete. Package List: 1 x Soda Valve3 x Gasket1 x User Manual Note: 1. Please allow 1-3 cm 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.