The carbonation cap is made of stainless steel, it is stronger and longer. It's easier to carbonate your drinks, you can enjoy them almost immediately. Backpressure is more portable, convenient and less expensive than CO2 systems. The carbonation tool has a simple and efficient carbonation process. You can use the carbonation cap to make your own carbonated water, carbonated beer, or even make your own carbonated drinks. You will love it and enjoy your drinks. It is designed to fit most PET bottles, it injects CO2 into the bottle. The battle will create carbonation. The carbonation cap is a very effective method of adding and maintaining carbonation in beverages for long periods of time. Description: This item is made of stainless steel, which is stronger and more durable, making it easier to carbonate your drinks! With this cap you can simply fill an old PET bottle with the cold liquid of your choice and carbonate by connecting your gas ball disconnector. With it you can make your own carbonated water, carbonated beer or even make your own soft drinks. It is designed to fit most PET soda bottles, injecting CO2 into the bottle, creating carbonation. The carbonation cap is a very effective method of adding and maintaining beverage carbonation for long periods of time. Specification: Condition: 100% Brand New Material: Stainless Steel Color: As Shown in the Picture Product Length: Approx. 6cm/2.4in Package weight: approx. 102g