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1. A connection between two pipes in the same water-supply system, or between two water-supply systems containing potable water.
2. A pipe fitting shaped like the letter U with the ends turned outward; used where one pipe crosses another in the same plane; also called a crossover fitting.
3. In an auditorium, a passage which usually parallels the rows of seats, forming a connection between aisles.
4. At the rear of a stage in a theater, a passageway that permits an actor to pass from one side of the stage to the other side without being seen by the audience.