HIC Bar's Wine Preserver Pump and Stopper Set is the must-have of wine accessories to extract excess air and reseal opened wine bottles with a powerful airtight, liquid-tight vacuum seal without any batteries to change. Aerating wine, swirling it in a glass or letting it "breathe" in a wine decanter, is an important step in developing its bouquet and softening its flavor when a bottle is first opened. However, exposure to oxygen for long periods of time deteriorates wine's quality and taste. Our Wine Preserver Pump and Stopper Set pumps oxygen out of the bottle and seals in freshness and flavor. To preserve an open bottle of wine, simply insert the stopper, place the vacuum pump on top while holding it in place, and pump the handle of the vacuum pump until there's a resistance for a fully sealed bottle.