Our carbonation cap is made of 304 stainless steel material and liquid ball lock 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 connecting your Liquid ball lock disconnect. It is designed to fit most soft drink PET bottles. So you could make your own soda water, carbonate beer or other soft drinks, easy and convenient. Features: HIGH QUALITY --- The carbonation cap is made from 304 stainless steel material, and it is a highly effective method to add and maintain carbonation in beverages for extended periods of time. EXCELLENT DESIGN --- This carbonation cap is a screw-on cap with an integrated ball lock fitting, will provide you a wonderful use experience. UNIVERSALLY APPLY --- Universal size, our stainless carbonation cap is designed to fit onto most soft drink PET bottles. PRACTICAL TOOL --- With this cap you can simply fill an old PET bottle with cold liquid of your choice and carbonate by connecting your Liquid ball lock disconnect. USEFUL HELPER --- With this carbonation cap, it can allow you make your own soda water, carbonate beer, or even making your own soft drinks. Specification: Condition: 100% Brand New Material: Stainless steel + Plastic Color: Sliver + White Carbonation Cap Size: 6 x 3.2 cm / 2.4 x 1.26inch (appr.) Liquid Ball Lock Size: 5.5 x 3.6cm / 2.17 x 1.42 inch (appr.) Liquid Ball Lock Under Diameter: 2.9 cm / 1.41 inch (appr.) Liquid Ball Lock Top Diameter: 2.4cm / 0.94 inch (appr.) Package Included: 1 x Carbonation Cap 1 x Liquid Ball Lock HIGH QUALITY --- The carbonation cap is made from 304 stainless steel material, and it is a highly effective method to add and maintain carbonation in beverages for extended periods of time. EXCELLENT DESIGN --- This carbonation cap is a screw-on cap with an integrated ball lock fitting, will provide you a wonderful use experience. UNIVERSALLY APPLY --- Universal size, our stainless carbonation cap is designed to fit onto most soft drink PET bottles. PRACTICAL TOOL --- With this cap you can simply fill an old PET bottle with cold liquid of your choice and carbonate by connecting your Liquid ball lock disconnect. USEFUL HELPER --- With this carbonation cap, it can allow you make your own soda water, carbonate beer, or even making your own soft drinks.