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, advanced technology, stable performance, and installation is simple. Compatible with sodasteam TR21-4 soda bottles as an alternative to Quooker Cube bottles. Threads: Tr21-4 female to Tr12-3 male. Note: Product may vary slightly between batches; minor differences in appearance or color may occur, but this does 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 sale. Note: Lighting and display settings may cause slight variations in color. Measurement tolerance: +/- 1-3 cm.