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This is a unique carbonation cap in homebrew market. This carbonation cap is a crew-on cap with an integrated Cornelius ball lock fitting. It is designed to fit onto most soft drink PET bottles. The carbonation cap is highly effective method to add and maintain carbonation in beverages for extended periods of time. With this cap you can simply fill an old PET bottle with cold liquid of your choice and carbonate by connecting your gas ball lock disconnect. The in-built 5/16" can attach 5/16" ID tubing and a 0.5 micron carbonation stone can attach on the end with the portability of being able to move the cap from bottle to beer bottle.