Use this Bottles Carbonation Cap to pressurize your bottle of beer or other carbonated drink with CO2. The cap will most surely fit most of the plastic bottles. Not only is it practical but it is also very durable as well. Made of stainless steel, you can reuse it as many times as you want. If you want to take a beer on the go, then this carbonation cap is perfect for that. Be sure that the carbonation will stay in the beer.