tampion

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tampion

[′tam·pē·ən]
(engineering)
A cone-shaped hand tool usually fashioned of hardwood that is forced into a lead pipe to increase its diameter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

tampion

A cone-shaped hardwood tool used by plumbers; forced into the end of a lead pipe to increase its diameter.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.