This is a kind of fine quality soda stream adapter, made of brass material, with fine durablity. This easy to use soda stream cylinder Filling Adaptor will enable you to fill your own CO2 from your larger bulk cylinder into smaller soda stream cylinders. Simple to install and easy to use. You can have a try.Features:This easy to use soda stream cylinder filling adaptor will enable you to fill your own CO2 from your larger bulk cylinder into smaller soda stream cylinders.Made of fine quality brass material, with fine durablity.For soda stream cylinder refill adapter bleed valve W21.8-14 or CGA320 connector.Can be used with large carbon dioxide tanks with CGA320 connectors.Simple to install and easy to use.How to use:Screw the adapter onto a commercially available CO2 bottle.Empty CO2 cylinder is screwed into the adapter.Open the large bottle valve.After approximately 15 or 20 sec the cylinder is completely filled.Close the valve of the large bottle.Open the venting valve.Unscrew the CO2 cylinder.Specifications:Name: AdapterMaterial: BrassThread for small bottle: 21*4Thread for big bottle: W21.8-14Thread Type: Outlet valve diameter 22mmItem size: 45 * 40 * 30mm / 1.77 * 1.57 * 1.18inItem weight: 148g / 5.21ouncePackage size: 100 * 60 * 30mm / 3.94 * 2.36 * 1.18inPackage weight: 150g / 5.29ouncePackage list:1 * Adapter