Good sealing performance, no air leakage when connected with the cylinder, more convenient to use.<br> Mainly used for the thread adapter of the soda machine cylinder, and can also be used as the air source switch.<br> Made of high-quality materials, high hardness, and wear-, long service life.<br> The thread is tight, superb technology, stable performance, and the installation and use method is simple.<br> Color: Gold<br> Material: copper<br> Package Contents:<br> 1X Thread Converts Adapter Female Tr21-4 to Male Tr21-3<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.