Features: Brand new and high quality Made of brass material, which is resistant to corrosion, oxidation, and has a good surfaces finish and sealing for a long service life. Easy to install. CO2 refilling adapter is easy to use and can fill carbon dioxide into a sodas bottle. TR21-4 to W21.8-14 connection, there will be no leakage when connect to the cylinder.The adjustable valves pin ensures compatibility with most cylinder valves changes. Whether you're at home or running a bustling establishment, our refill adapter provides a convenient solution for connecting and refilling your carbonation tanks. Upgrade your carbonation experience with our reliable and versatile refill adapter, designed to meet the needs of different users and ensure efficient carbonation every time. Specifications: Material:Copper Size:Approx.77.9mm/3.07inch Package Includes: 1 Set CO2 Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.