The plumbing system for a block of high rise flats is simplified by arranging the pipes in a common vertical shaft. The cold water supply (1), the hot water supply (2) and the hot water return (3) are supported from a beam (F) mounted between vertical supports. The drain pipe (4), the lavatory cistern overflow pipe (5) and the ventilation duct are also mounted on the beam (F). A series of such structures are placed on above the other at each floor level behind each lavatory where all the valves and pipe connection are easily accessible in the completed building.
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