What's a Coravin? Well, it is a tool that functions as both a bottle opener and wine pouring/wine preservation system. A thin needle pierces the foil and the wine cork, leaving the cork in place. The wine is extracted and poured out through the needle while the Coravin simultaneously replaces the displaced wine with pressurized argon, a noble gas, completely inert. When the needle is removed, the cork reseals itself.