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1. A system for conveying water from a first water supplying element to a second water supplying element, comprising a first hollow water conveying member connectable to the first water supplying element in water communication therewith; a second hollow water conveying member connectable to the second water supplying element in water communication therewith and connectable with said first water conveying member in water communication therewith so that said first and second water conveying members form a unit through which water flows directly from the first water supplying element to the second water supplying element, wherein said first and said second water conveying members, when they are connected with one another, are turnable relative to one another in direct surface-to-surface contact with one another over straight surfaces about a turning axis between a plurality of angular positions relative to one another so that said first water supplying element and the second water supplying element are locatable in a plurality of positions relative to one another; and wherein said first water conveying member has a first opening for water entry and said second water conveying member has a second opening for water exit, and said first opening and said second opening of said first and second water conveying members extend transversely to said turning axis and are coaxial with each other so that the water supplying elements connected by the device are also coaxial with each other; and a water conveying pipe positionable between said water conveying members and having two opposite ends connectable to said water conveying members in direct surface-to-surface contact over straight surfaces, to connect the ends of said water conveying pipe to the water supplying elements so that water flows from the first water supplying element through one of said water conveying members, then through said water conveying pipe, and then through another of said water conveying members to the second water supplying element.
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