Description <br> 1. This adapter applies to all water machines with TR21-4 interface, used for connecting external carbon dioxide cylinder/tank. <br> 2. New integrated design and improved internal sealing structure avoid the use of any seal glue and are safer and more durable. <br> 3. With 8mm male quick disconnect, easy to connect the female head, standard size, combined tightly, no air leakage. <br> 4. Made by High-quality materials, surface oxidation matte treatment makes it lighter, more beautiful, and stronger. <br> <br> Note:Installation guide not included, we strongly recommend you seek professional installation. <br> Please check as much as possible to make sure the item is what you need. <br> Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use <br> Colour:Silver <br> Material:Metal <br> <br> Package Contents: <br> 1 x Carbon Dioxide Filling Adapter <br> <br> Only the above package content, other products are not included. <br> 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. <br>