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Plumbing, Drain and Sewer are used.
The glossary provides a list of words and termscommon in drainage issues, many used in this manual.It is not intended to be a complete reference; othersources should be sought for additional information.

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Plumbing-the system of pipes, tanks, fittings, and other apparatus required for the water supply, heating, and sanitation in a building.
Drainage-the action or process of draining something.
Sewer-an underground conduit(tube)  for carrying off drainage water and waste matter.
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