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water seal

a small amount of water contained in the trap of a drain to prevent the passage of foul smells
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for water seal
Historical Examples
  • The water seal in the traps may evaporate, and thus give direct sewer-air connection with the house.

    Convenient Houses

    Louis Henry Gibson
  • At S and T are glands which provide a water seal against the inleakage of air and the outleakage of steam.

    Steam Turbines Hubert E. Collins
  • Both tubes were connected to a water seal bottle, and the dressing was applied.

    Warren Commission (4 of 26): Hearings Vol. IV (of 15) The President's Commission on the Assassination of President Kennedy

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