Excellent sealing ability, preventing air leakage when connected to the cylinder, making it more convenient to use. Primarily utilized for the thread adapter of the soda machine cylinder, and can also function as an air source switch. Constructed from high-quality materials, featuring high hardness and durability for an extended lifespan. The threads are tight with exceptional craftsmanship, ensuring stable performance; installation and usage are straightforward. If you wish to employ a soda bottle similar to the certain brand's model instead of a different brand's bottle, this adapter is suitable. Threads: Tr21-4 female to Tr12-3 male. Please note: The product may undergo continual updates; variations in batches may result in slight differences or color variations that do not affect performance. Color: Photo Color Material: Copper Package Contents: 1 x Soda CO2 Gas Converter Only the items listed in the package are included; other products are not part of the offer. Note: Light reflection and varying displays may cause slight differences in color from the actual item. Measurement error is allowed within +/- 1-3cm.