①. Good sealing performance, no air leakage when connected with the cylinder, more convenient to use. ②. Mainly used for the thread adapter of the soda machine cylinder, and can also be used as the air source switch. ③. Made of quality materials, high hardness, and wear-resistant, long service life. ④. The thread is tight, superb technology, stable performance, and the installation and use is simple. ⑤. If you want to use a sodasteam TR21-4 soda bottle instead of a Quooker Cube bottle, you can use this adapter. ⑥. Threads: Tr21-4 female to Tr12-3 male. ⑦. 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. ⑧. Colour: Photo Color. ⑨. Material: copper. ⑩. Package Contents: 1 x Soda CO2 Gas Converter. ⑪. Only the above package content, other products are not included. ⑫. 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.