chain tongs a pipe wrench used for turning large pipes; an adjustable chain circles the pipe with its ends connected to the head whose teeth engage the pipe
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Wiktionary
Substantiv
pipe wrench -
An adjustable wrench British spanner with a toothed jaw for gripping pipe, frequently used by a plumber or pipe fitter, to loosen and tighten pipes with threaded connections.
OmegaWiki Dictionary
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pipe wrench An adjustable wrench (British: spanner) with a toothed jaw for gripping pipe, frequently used by a plumber or pipe fitter, to loosen and tighten pipes with threaded connections, designed such that any forward pressure on the handle tends to pull the jaws (otherwise slightly mobile in the tool plan) tighter together.