A tap's a valve for controlling the release of a liquid or gas. In the British Isles and most of the Commonwealth the word's used for any everyday type of valve, particularly the fittings that control water supply to bathtubs and sinks. In the U.S. the usage's sometimes more specialised, with the term "tap" restricted to uses such as beer taps and the word faucet being used for water outlets. Water taps The physical characteristic which differentiates a spigot from other valves's the lack of an… (More on Faucet)