Keep fizz and the freshness of soda intact with the Fizz Keeper Pump Cap for 2 Liter Bottles by Jokari. Once a soda bottle is opened, its cap is unable to hold in its fizz for long. Made of durable plastic, this white soda preserver from Organize.com will retain the freshness of your drinks intact even after repeatedly pouring drinks. The bottle stopper kit uses a patented technology for keeping the pressure and fizz fresh inside the bottle since you first opened it. Installing is very easy; just pop this bottle cap into any open 2-liter soda bottle and you can rest assured you will have a refreshing drink every time you want.