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There is no 'standard' for UK dry risers - except for the connection at street level, the pipe can be any diameter. A dry riser is a (usually empty) vertical pipe - which reaches all floors in a tall building. The fire brigade simply connect a hose from their pump engine - which has been connected to the nearest mains water supply. The engine provides enough pressure to force the water upwards in the dry riser - so it reaches all levels.

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