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reducing coupling[ri′düs·iŋ ‚kəp·liŋ]
A coupling used to connect a smaller pipe to a larger one.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. A thinner or solvent; used to lower the viscosity of a paint, varnish, or lacquer.
2. A reducing pipe.
3. A reducing valve.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.