| 摘要 |
An extender is used with a hole saw or other cutting or drilling bit to drill/saw a passageway, through thick or distant materials in a residential or commercial building, for installation of a fluid pipe, an electrical conduit, or other conduits or elongated members. The extender and methods of using the extender comprise a hollow pipe with only external threads at each end. After the passageway is created, the externally-threaded pipe may be left in place in the passageway for use in its plumbing capacity. No internal threads are present in the interior surface of the pipe, so that turbulent fluid flow through the pipe is prevented or minimized, and, as a result, pitting, damage, and disintegration of the interior wall of the pipe is prevented or minimized.
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