backwater valve

noun
a valve for preventing flowing liquid, as sewage, from reversing its direction.
Also called backflow valve.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Where the building is subject to backwater, the subsoil drain shall be
  protected by an accessibly located backwater valve.
As a property owner, you are responsible for your cleanout and backwater valve.
Maintain and inspect the backwater valve as recommended by manufacturer.
Confirms backwater valve is accessible for service or replacement, if installed.
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