Features:<br />Made of high-grade brass, corrosion-resistant, wear-resistant and with long service life.<br />Enable you to fill CO2 from the larger bulk cylinder into smaller cylinders.<br />Direct replacement for the old or damaged one.<br />Manufactured with exquisite craftsmanship to guarantee stable performance.<br />Easy to install and safe to use.<br/>Specifications:<br />Material: brass<br />Color: as pictures show<br />Thread: TR21-4 to CGA320A(pplicable to the United States, Canada)/TR21-4 to W21.8 pplicable to Europe (optional)<br />Package weight: 176g<br />Package size: 8 * 8 * 5cm<br/>How it works:<br />1.Cool the Soda-Stream Cylinder in the freezer for 1 hour.<br />2.Screw the adapter to a commercial CO2 gas cylinder.<br />3.The empty CO2 cylinder is screwed into the adapter.<br />4.For most big cylinders: turn the big cylinder upside down. (if you can not refill when the CO2 tank standing, because some of the tank have not the dip tube (syphon tube)inside.)<br />5.Carefully Open the valve of the large gas bottle(The valve on the Soda-Stream Cylinder closes the flow if it is opened too much. This will happen if you open the big cylinder too much / too fast. The trick is to open the big cylinder very carefully. You will hear the airflow. So to fill it successfully).<br />6.After about 15-20 sec., The cylinder is completely filled.<br />7.Close valve of the large gas bottle.<br />8.Opening the bleed screw to drain residue remaining gas.<br />9.Unscrew the CO2 cartridge – done.<br/>Package List:<br />1 * Filling Adapter