BarWerks Vacuum Wine Bottle Stoppers (Set of 3) All-in-one Vacuum Stopper, No Separate Pump Required! The BarWerks, All-in-one vacuum wine bottle topper creates an airtight vacuum without a separate pump! Pump the top button. When the button stays in the down position, an airtight vacuum has been established. Vacuum wine bottle toppers preserve your wine once the bottle has been opened by slowing the oxidation process. Fits all corked wine bottles. Convenient date feature for tracking the date each bottle was opened. Durable one-piece design. No separate pump required. Not for use with screw tops or sparkling wines. Hand wash.