Specification: Type: W21.8-14 Color: Gold Pressure gauge: 2000/3500psi Pressure gauge direction: Radial/Axial Characteristic: 1. Prepare the items you will need: wrench, inflation joint, large carbon dioxide tank, empty quick-connect soda bottle. 2. First loosen the exhaust screw, then use a wrench to install our inflation connector on your (W21.8-14) large carbon dioxide tank. 3. Twist the empty bottle into the filling station. 4. Tighten the exhaust valve to securely lock the cylinder. This is the most important step and also the feature of our loading valve to allow safe soda bottle filling. 5. Slowly open the large carbon dioxide tank and add the carbon dioxide gas into the soda bottle. After about 15 to 20 seconds, the cylinder is completely filled. 6. Once filling is complete, close the valve of the large CO2 tank and then unscrew the exhaust valve to release the gas. Remove the soda bottle. Package includes: 1 x Transfer Adapter Quick Connect Adapter Notice: - The color of the item may vary slightly due to photography and different PC monitors. - The size may be slightly different due to manual measurement. Your understanding is appreciated.