Welcome to our store! This carbonation cap is made of 304 stainless steel material and is a very effective method for adding and maintaining carbonation in beverages for longer periods. This carbonation cap is a screw cap with an integrated Cornelius ball lock. It is designed to fit most PET soda bottles. With this cap, you can easily fill an old PET bottle with cold liquid of your choice and carbonate by connecting your liquid ball lock. Make your own soda water, carbonate beer, or even make your own soft drinks. Our carbonation cap is made of 304 stainless steel material and the liquid ball lock is made of high-quality plastic material, robust and durable to use. The package includes 1 x carbonation cap and 1 x liquid ball lock. Specifications: Condition: 100% brand new. Material: Stainless steel plus plastic. Color: Silver plus white. Carbonation Cap Size: 6 x 3.2 cm or 2.4 x 1.26 inches approximately. Liquid Ball Lock Size: 5.5 x 3.6 cm or 2.17 x 1.42 inches approximately. Liquid Ball Lock Bottom Diameter: 2.9 cm or 1.41 inches approximately. Liquid Ball Lock Top Diameter: 2.3 cm or 0.91 inches approximately. Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory customer service.