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Explanation: Vertical tubing... although this site is not medical at all, I think the concept will be similar to what you are looking for.
Hope it helps.
Diccionario del Agua - Aguamarket- [Translate this page ]
... Bajante. Tubería vertical que recibe aguas negras o aguas servidas de tuberías
de desagüe de los pisos superiores de una edificación, y las conduce a las ...
aguamarket.com/diccionario/terminos.asp?Id=3306 - 16k - Cached - Similar pages
David Davis Local time: 08:29 Native speaker of: English PRO pts in pair: 45