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 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 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 CGA320 Valve of CO2 Tank.Color: As ShownMaterial: metalPackage Contents:1X Refill Quick Adapter1x Install seal fittings KitOnly 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.