Where are underground hydrants used?

Underground Fire hydrants or flush type hydrants are used in certain parts of the world, which experience extremely cold weather (and water in above ground hydrants can freeze). They are also suitable for areas like Air fields where installation of normal hydrants is not possible. The Hydrant outlet is just below the surface of the ground protected by a cover, which is flush with the pavement, and so does not interfere with the aboveground operations.
For operating these hydrants, stand pipes are connected to the outlet of the underground hydrants, and hoses can then be connected to the outlet of the stand pipes.

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