How to operate:1. Confirm that switch valve A and release valve C are closed. 2. (Put the gasket into the connector) Connect the connector (A end) to the CO2 tank. (Tighten with a wrench.) 3. Connect the small gas bottle to the adapter (B end). 4. Open the valve of the large Co2 tank. 5. Carefully open the switch valve A (20-30 degrees counterclockwise), charge for 30-60 seconds, and then close the carbon dioxide bottle valve (make sure the switch valve A is open) 6. After the filling is completed, other gases in the tube will not be released when deflating. 7. After inflating, disconnect the small cylinder. 8. Repeat filling process for each cylinder. Steel braided pipe length: 90cm 8mm quick male male thread: M11*1 Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:Metal Package Contents: 1 x CO2 Refill Station Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.