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Pipe wrench
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<p>A pipe wrench is any of several types of <a href="/facts/Wrench/DWaIh3DW">wrench</a> that are designed to turn <a href="/facts/Threaded_pipe/myQJrje6">threaded pipe</a> and <a href="/facts/Piping_and_plumbing_fitting/8saV82HD">pipe fittings</a> for assembly (tightening) or disassembly (loosening). The Stillson wrench, or Stillson-pattern wrench, is the usual form of pipe wrench, especially in the US. The Stillson name is that of the original patent holder, who licensed the design to a number of manufacturers; the patent has since expired. A different type of wrench with compound leverage often used on pipes, the <a href="/facts/Plumber_wrench/6H1DD8X3">plumber wrench</a>, is also called a "pipe wrench" in some places. </p>