The Coravin works by inserting a tiny hollow needle straight through the cork. When you pull the trigger on the device, argon gas, which doesn’t interact with the wine or affect the aging process, is pumped into the bottle, pressurizing it, and drawing the wine through the needle and then into your glass. After you’re done, the needle is removed, and the cork naturally reseals itself, keeping the bottle in perfect condition and allowing you to enjoy the wine one glass at a time whenever you like.