Specifications:The cylinder refill adapter is made of premium brass material to make sure it is durable and sturdy to use.This refill adapter features high quality bleed valve for safe and well-controlled release of gas.It can be installed on large CO2 tanks with CGA320/W21.8 connector.The adapter is easy to use, which is a good replacement for the old and broken one.Item Name: Cylinder Refill AdapterMaterial: BrassType(Optional): W21.8/CGA320Features: Durable, Portable, Easy to UseType CGA320Diameter: 21cm/8.26 (Approx.)Type W21.8Diameter: 22cm/8.66 (Approx.)Notes:CGA320 is applicable to USA, Brazil, Colombia, Philippines.W21.8 is applicable to KOR, Japan, UK, Germany, France, Poland, Norway, Switzerland, Russia, Ukraine, South Africa, Sweden, Chile, Czech Republic, Singapore.Due to the light and screen setting difference, the item 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Cylinder Refill Adapter The PXCL team is at your service and we hope you enjoy your life