1. the items you need :wrench,refill adpater set,Co2 filling tank,empty soda cylinder. 2.Release the bleed valve first and then use a wrench to install refill station to your Co2 tank. 3.Place the empty cylinder into the filling place in a rotating motion.Screw the bleed valve tightly in order to lock the cylinder tightly.This is the most important step and also is the characteristic of this refill station from ,in this way refill soda cylinder than other's Co2 refill station. 4.Open the Co2 tank slowly to refill Co2 to soda cylinder.After approximately 15 ~20 seconds the cylinder is completely filled. 5.Filled fully. the Co2 tank valve first and then unscrew the bleed valve to release the and the cylinder.Uninstall soda cylinder-Done.Make soda water freely. Refill DUO Art Terra Pink Soda Cylinder Carbonator From Co2 Carbon DioxideTank,Refilling Station Adaptor kit This fill adapter set is used to your external commercial CO2 tanks like 5lb,20lb and 50lb,so that you can refill your DUO,Terra,Art quick disconnect new-version Soda cylinder yourself . W21.8-14(DIN 477 / M22-14) connector Common in , JP, UK, , , , , Switzerland, Russia, Ukraine, South Africa, Sweden, Chile, , Singapore etc. Specifications: Weight: 196g Length: 110mm To the deflated width: 50mm Square length: 52.6mm Width of square: 35.6mm Thickness of square: 16mm Type: W21.8-14 Material: copper colour: silver Package Contents: 1 x adapter 1 x washer 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.