draft tube

noun
the flared passage leading vertically from a water turbine to its tailrace.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Total removal of draft tube piers may not be a possibility due to structural
  reasons.
Water from the turbine exits through the draft tube to the tailrace.
Raw water and chemicals mix with previously formed lime slurry in a centrally
  located draft tube with impeller.
Some problems were experienced with the gear boxes for the draft tube mixers,
  however that problem has been resolved.
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