1. This adapter applies to all water machines with TR21-4 interface, used for connecting external carbon dioxide cylinder/tank. 2. New integrated design and improved internal sealing structure avoid the use of any seal glue and are safer and more durable. 3. With 8mm male quick disconnect, easy to connect the female head, standard size, combined tightly, no air leakage. 4. Made by high-quality Material, surface oxidation matte treatment makes it lighter, more beautiful, and stronger. 5. Comes with a small wrench for easier installation and disassembly.<br><br>Colour:silver Material:Metal<br><br>Package Contents: 1 * Connector Accessories 1 * Wrench<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.