blind nipple[¦blīnd ′nip·əl]
A short piece of piping or tubing having one end closed off; commonly used in boiler construction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A nipple, one end of which is capped.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.