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In plumbing work, a short collar consisting of a threaded sleeve used to connect two pipes.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A short internally threaded section of pipe, used to join two pipes or conduits.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.