Spring tube length: 50cm 8mm quick male male thread: M11x1 Thread type 1 (outlet valve diameter 21mm); carbon dioxide tank valve (USA, CAN, Brazil, Colombia, Philippines...) Thread type 2 (outlet valve diameter 22mm); DIN477 / W21.8-14 / m22-14 CO2 tank valve (, JP, UK, Germany, France, , , Switzerland, Russia, Ukraine, South Africa, Sweden, Chile, Republic, Singapore) Operation : 1. Confirm that on-off 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 (end B). 4. Open the Co2 tank valve. 5. Carefully open the switch valve A (20-30 degrees counterclockwise), charge for 30-60 seconds, and then close the valve of the carbon dioxide bottle (make the switch valve A is open) 6. After filling, open the release valve C to release the residual gas in the hose. 7. After inflation, disconnect the cylinder. 8. Repeat the filling process for each cylinder. model: W21.8-14 Material: Metal Colour: As shown Package Contents: 1 x Adaptor 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.