There is always water in the bathroom drain, but the bath water can also flow down, why

Updated on Bathroom 2024-08-19
2 answers
  1. Anonymous users2024-01-24

    Are you talking about floor drains? If it is a floor drain, the floor drain has a water seal to prevent odors.

  2. Anonymous users2024-01-23

    The water pipe has an elbow, which is odor-proof, and is called a ps bend.

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