Compatible Model: Co2 Quick Adapter only replacement for Crystal 3.0/Duo/Terra/Art/E-Duo/ soda maker,can connect Co2 refill adapter Accessories,Co2 Cylinder with TR21-4 Male Thread.Easy to Install: The Co2 Quick adapter with split design, it is very convenient to install. It can be installed without removing the machine base. Comes with 3 replaceable rubber rings. Used to replace aging, dirty, damaged rubber rings.Please note:the physical slightly color difference or difference, does not affect the use, please do not mind!Colour:-RedMaterial:aluminumPackage Contents:1 * CO2 Quick Adapter3 * replaceable rubber ringsOnly 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.