[FIZZ KEEPER]: like a wine bottle stopper but for your fizzy drinks instead. Lasts up to 7 days in your plastic water bottles. Simply replace the standard bottle cap with our Fizz Keeper bottle cap to keep uncapped fizz close at hand. [FOR ALL BOTTLES]: Each cap in this set works on any plastic water bottle, from the 340ml to the 590ml to the 1 liter and even the 2 liter bottles. [SAFE AND DURABLE]: Safe, durable and eco-friendly material: food grade ABS and silicone rubber. The silicone loop prevents leakage of liquids. Dishwasher safe. So all your worries have been taken care of, never waste your fizzy drinks again. Bettter then a pump bottle dispenser. Great bottle cap better than a pump spray bottle. [Date dial design]: for time adjustment function, allows storage for time keeping. [EASY TO USE]: After opening, replace the old beverage lid with a beverage sealer and press down by pumping. 8 to 20 pumps are usually sufficient.