Notes Before Use:Please keep your empty pink cylinder for terra/art/duo in the freezer the night before for better fill results.because the Co2 will expand as it enters a warm cylinde,so you 't get enough CO2 in there, a glove is needed to hold the cold cylinder..It only fit for pink Co2 cylinder system with quick connect valve(no thread).Please confirm the style before purchasing. Easy Installation: Replacement for terra/duo/art soda machine.With the CO2 Refill Adapter,You can fill CO2 cartridges simply yourself by connecting a commercial CO2 bottle with your pink CO2 cylinde with quick connect. Function upgrade: It is no longer necessary to exchange your empty CO2 cylinders,no Complicated towing with our filling adapter,It built from quality materials for durability,it is With Gauge. It is designed for W21.8 Valve of CO2 Tank. Color: As Shown Material: metal Package Contents: 1X Soda Refill Quick Adapter 1x Install seal fittings Kit Only the above package content, other 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.