FizzVac Vacuum Champagne Stopper in Black Satin Gift Bag, Set of 2 Vacuum Pump keeps champagne fresh by pumping air into opened bottles; simply push and release to inject air. Set of 2 unique and very innovative champagne stoppers that allow you to store opened bottles of champagne and keep them fresh for as long as you require. Locking clip locks onto your bottle to help create an airtight vacuum to preserve fizzy drinks and prevents the stopper from flying off due to pressure buildups. Storage date dial allows you to set storage date reminders. FizzVac Vacuum Champagne Stopper retains fizz very well and is designed to work with champagne bottles with corks, not twist cap bottles.