describeThis is a premium soda water adapter made of brass material with good durability. This easy-to-use soda cylinder fill adapter will allow you to fill your own CO2 from a larger bulk cylinder into a smaller soda cylinder. Easy to install and easy to use. you may try it.feature:This easy-to-use soda cylinder fill adapter will allow you to fill your own CO2 from a larger bulk cylinder into a smaller soda cylinder.Made of high quality brass material, durable.Easy to install and easy to use.how to use:Screw the adapter onto a commercially available CO2 bottle.Screw the empty CO2 cylinder into the adapter.Open the large bottle valve.After about 15 or 20 seconds, the cylinder is completely full.Close the valve of the large bottle.Open the exhaust valve.Unscrew the CO2 cylinder.Specification:name: adapterMaterial: Brasspacking list:1 * Adapter