The Coravin wine system allows you to drink your wine without opening the bottle. Through this wine system, you don't have to throw away your bottle of wine after 1 day. This system only works for bottles with a natural cork. There is a needle in the wine system and it goes through the cork. Argon gas is injected through the bottle. The gas is heavier than oxygen; it causes the wine to rise. Because of that high pressure, no oxygen gets to the wine. This allows you to keep your bottle longer. Once the cap is off the wine bottle you put the screw cap on it, so no oxygen can get to it.