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Wharf Hydrants

A wharf head by definition is a hydrant which connects directly to a wet riser. On wharves and piers there is no practical ability to install a "hydrant bury" complete with foot valves and thrust blocks and the name has stuck to all hydrants that are basically just hydrant tops screwed onto vertical pipes. Their common characteristic is that they literally thread onto a piece of iron pipe. The majority of wharf heads thread onto 4" pipe and have a single operating nut at the top of the hydrant.