This item is used to refill your small / Co2 tanks from your large tanks so that you can refill your small tanks easily . Hose length: 150cm Pressure gauge range: 250bar 3500psi Working pressure: 3000psi How it works:Screw the Nut to CO2 gas cylinder and tighten it by wrench. CQC External adaptor connect the quick coupler. CQC External adaptor connect into Soda machine. Open the valve of the large gas bottle. Done,you can use your Soda machine. if you want to unscrew the item from the machine: Close valve of the large gas bottle. button of Soda machine to drain residual Co2(if you don't follow this guide to disconnect the coupler, the o ring of quick coupler be blowed out) Unscrew CQC adaptor from Soda machin and unscrew Nut from CO2 gas cylinder Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. 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 Color: As Shown Material: Metal Package Contents: 1 x Refilling Station Charging Adapter 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.