Usage Tips: 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 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: Instead of changing the entire cylinder or the heater, this CO2 quick adapter lets you use the carbon dioxide bottle, saving you considerable time and cost. Material: Aluminum alloy colour: rose Red Package Contents: 1 x CO2 Quick Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.