Source: wikibot/cask-breather
= Cask breather
{wiki=Cask_breather}
A cask breather is a device used in the storage and serving of cask beer, particularly in pubs and breweries. It is designed to maintain the proper balance of air and carbon dioxide in a cask of beer. When a cask is tapped and beer is drawn from it, a vacuum can form inside the cask as beer is removed. This can affect the quality and freshness of the beer, leading to oxidation and spoilage.