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Fermzilla - Plastic Carbonation Ball Lock Cap

This is the same cap as found in the Fermzilla Pressure Kit. It is a screw on cap with a cornelius ball lock fitting. This is meant to be screwed onto pop bottles or PET bottles. 

Fill a pop bottle with any liquid, attach this and carbonate it by connecting a gas ball lock post and boom! You've got a carbonated beverage. You could use it for beer, water, juice, coffee etc etc.