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, and can also be used as the air source switch. Made of high-quality materials, high hardness, wear-resistant, long service life. The thread is tight, with excellent craftsmanship, stable performance, and simple installation and use. Compatible with sodasteam TR21-4 soda bottle as a replacement for Quooker Cube bottle. Threads: Tr21-4 female to Tr12-3 male. Note: Product may vary slightly between batches; slight differences in color or design may occur, which do not affect functionality. Color: As shown in photo Material: Copper Package Contents: 1 x Soda CO2 Gas Converter Only the above package content is included; other items are not part of this package. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.