A beer tap is a valve, specifically a tap, for controlling the release of beer. While other kinds of tap may be called faucet, valve or spigot, the use of tap for beer is almost universal. The word was originally coined for the wooden valve in traditional barrels. Beer served from a tap is largely known as draught beer, though beer served from a cask is more commonly called cask ale, while beer from a keg may specifically be called keg beer. Beer taps can be also used to serve similar drinks like cider or long drinks.
There are many different types and styles of beer or keg taps.
Etymology
Originally the word referred to a solid wood stopper used to plug the hole in a barrel, so as to contain the contents. The shape was identical to a taproot, from which the name derived.
The word was originally coined for the wooden valve in traditional barrels.
Usage
Pressure-dispense bar tap
Beer supplied in kegs is served with the aid of external pressure from a cylinder of carbon dioxide (or occasionally nitrogen) which forces the beer out of...
Charlie Stross
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