4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA 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 is simple<br> If you want to use a sodasteam TR21-4 soda bottle instead of a Quooker Cube bottle, you can use this adapter.<br> Threads: Tr21-4 female to Tr12-3 male.<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:Photo Color<br> Material:copper<br> Package Contents:<br> 1 x Soda CO2 Gas Converter<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.