High Quality: Made of stainless steel material, stronger and last longer, sturdy and perfect polishing, it is used longer and easier than ever to carbonate your drinks! Cost-effective carbonation tool: Use it to counteract PET bottles, ball (gray) ball fittings, or liquid (black) ball fittings, more portable, convenient, and cheaper than CO2 systems Easily Used: Attaches to plastic bottles and connects to a gas-side ball breaker in order to inject CO2 into the bottle, creating carbonation, your beer is available to drink almost immediately. Miscellaneous Use: Carbonation caps can carbonate a number of beverages, including beer, soda, water, and juice, can also clean your beer line and to counter the filling of pressure bottles