Ourcarbonation cap is made of 304 stainless steel material and liquid balllock is made of high-quality plastic material, sturdy and durable to use. With this cap you can simply fill an old PET bottle with cold liquid of your choice and carbonate by connectingyour Liquid ball lock disconnect. It is designed to fit most soft drinkPET bottles. So you could make your own soda water, carbonate beer or other soft drinks, easy and convenient. Features:Thecarbonation cap is made from 304 stainless steel material, and it is a highly effective method to add and maintain carbonation in beverages forextended periods of time.This carbonation cap is a screw-on cap with an integrated Cornelius ball lock fitting. It is designed to fit onto most soft drink PET bottles.Withthis cap you can simply fill an old PET bottle with cold liquid of yourchoice and carbonate by connecting your Liquid ball lock disconnect. Making your own soda water, carbonate beer, or even making your own soft drinks.Specification:Condition: 100% Brand NewMaterial: Stainless steel + PlasticColor: Sliver + WhiteCarbonation Cap Size: 6 x 3.2 cm / 2.4 x 1.26inch (appr.)Liquid Ball LockSize: 5.5 x 3.6cm / 2.17 x 1.42 inch (appr.)Liquid Ball LockUnder Diameter: 2.9 cm / 1.41 inch (appr.)Liquid Ball LockTop Diameter:2.3 cm / 0.91 inch (appr.)Package Included:1 x Carbonation Cap1 x Liquid Ball Lock.