Perfect Compatibility & Easy Installation: Tailored for machines such as DUO, ART, TERRA, E-DUO/Crystal 3.0/, our CO2 quick adapter ensures an effortless connection with standard 60L CO2 cylinders with traditional TR21-4 trapezoidal thread. The split design allows easy installation without removing the machine base or causing any damage. and Quality Material, Reliable Performance: Crafted from top-grade aluminum alloy, the CO2 adapter for soda water boasts superior corrosion resistance, fire and moisture resistance. This sturdy construction combined with excellent sealing capability provides excellent oxidation and rust protection, assuring durability and reliable performance. Replaceable Accessories - Prolonged usage & Reduced Maintenance: The quick connect QC of this adapter comes with a replaceable rubber ring. In case gets dirty or loose, you can simply replace it with a new one, extending the overall durability and reducing maintenance cost. Cost-Friendly, Time-Saving Solution: