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It is the same as the object in 16oz cans of Guinness. It is a one time CO2 cartridge which infuses the beer with a burst of CO2 when it is opened. This is why Guinness has so much foam when you open it. Many beer "experts" believe beer needs to have a certain amount of CO2 to allow the full flavor of the beer to be experienced.

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14y ago
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Q: Why is there a plug in Bottles of Guiness Draught?
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