A hydrant is an outlet from a fluid main often consisting of an upright pipe with a valve attached, from which fluid (e.g. water or fuel) can be tapped.
Depending on the fluid involved, the term may refer to:
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Fire hydrant for firefighting water supply
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Flushing hydrant for cleaning water mains
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Hydrant network systems used to transport aviation fuel from an oil depot to an airport, to fuel aircraft
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Snowmaking hydrants, which use water and air
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Standpipe (street), a type of domestic or neighbourhood hydrant for dispensing water when supply is interrupted or absent
