Description: Quick Inflation: This Sodastreaming bottle quick inflation adapter with Tr21-4 thread is designed for inflating from large CO2 bottles to 0.6L small bottles, making it a convenient tool for your beverage needs.Material: Made of durability aluminum alloy, this adapter is built to last and withstand heavy use, ensuring you get the most out of your purchase.Perfectly Fit: With an outlet 8mm quick connect and inlet Tr21-4 thread, this adapter ensures a secure and tight connection for efficient gas transfer.Versatile Use: Most commonly seen on Sodastreaming fill adapters/stations, this product can be used in various settings where quick and efficient gas transfer is needed.Package Includes: Each purchase comes with a Sodastreaming bottle quick inflation adapter, providing great value for your money. Size Chart: outlet:8mm/0.31inchquick connect inlet Tr21-4 thread Package Includes: 1 set Sodawater Cylinder Refilling Adapter Note: Please allow slightly errors 1-2cm differences due to manual measurement.