Specifications: Made of premium brass material, the cylinder refill adapter is durable and sturdy to use. With the high quality bleed valve, the refill adaptor is to ensure safe and well-controlled release of gas. This product 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 Adapter Material: Brass Type(Optional): W21.8/CGA320 Features: Durable, Portable, Easy to Use Valve Diameter: 21cm/8.26" (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'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 6 x Gaskets