1Aluminum and Brass Materials: Made from brass and aluminum alloy, the CO2 quick adapter is erosion resistant, durable, and has a polished surface, ensuring reliable quality and preventing oxidation and rust. 2TR21 4 Thread: The TR21 4 thread ensures a secure and quick connection between the adapter and the CO2 steel bottle, eliminating the risks of leaks. 3Easy Operation: Designed for flexibility, it is suitable for DUO, for TERRA, for Art soda machines, allowing for easy connection between soda bottles and gas cylinders. It comes with two washers for better sealing. 4Versatile Compatibility: Compatible with 60L aluminum CO2 cylinders with a screw valve, making it a convenient and practical accessory for soda machine enthusiasts. 5Reliable User Experience: With excellent sealing capabilities, the adapter allows you to effortlessly create and enjoy your favorite soda beverages without worrying about safety issues.