offset elbow

A pipe fitting whose shape has the outline of the letter S, used for connecting lengths of straight pipe that are parallel to, but displaced from, each other.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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the better to reach the S-pipe under the kitchen sink,
The witness said he recovered hair, blood, flesh and bone from the S-pipe in the bathroom sink.