This fill adapter set is designed for use with external large commercial CO₂ tanks, such as 5 lb, 20 lb, and 50 lb cylinders, enabling users to refill DUO, Terra, and Art quick-disconnect new-version cylinders at home. Style: W21.8 / CGA320 Color: As shown Material: Metal How to use: 1. Prepare the required items: wrench, charging connector, large CO₂ tank, and empty quick-connect cylinder. 2. Loosen the exhaust screw, then use the wrench to install the charging connector onto the large CO₂ tank. 3. Rotate and place the empty cylinder into the filling position. 4. Tighten the exhaust valve to securely lock the cylinder in place. This step ensures safe operation and is a key feature of this charging valve. 5. Slowly open the valve on the large CO₂ tank to begin refilling the cylinder with CO₂ gas. Refilling typically takes approximately 15–20 seconds. 6. Once fully filled, close the valve on the large CO₂ tank first, then unscrew the exhaust valve to release residual pressure before removing the cylinder. Due to variations between production batches, minor differences in product appearance or printed text may occur; these do not affect functionality. Package Contents: 1 × CO₂ Cylinder Refill Fill Station Adapter Note: Color representation may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.