Good sealing performance, no air leakage when connected with the cylinder, more convenient to use . Mainly used for the thread adapter of the soda machine cylinder, can also be used as the air source switch . Made of high-quality materials, high hardness, wear-, long service life . The thread is tight, superb technology, stable performance, the installation use is simple If you want to use a sodasteam TR21-4 soda bottle instead of a Quooker Cube bottle, you can use this adapter . Threads: Tr21-4 female to Tr12-3 male . 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:copper Package Contents: 1 x Soda CO2 Gas Converter Only the above package content, other products are not included . Note: Light reflection 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 .