However, when a sink isn’t used for an extended period, especially during vacations or long absences, the water inside the trap can slowly evaporate.
Once that protective water seal disappears, unwanted odors may begin creeping back into the home.
In some cases, tiny drain insects can also find their way through the opening.
That’s where the upside-down glass comes in.
Why Place a Glass Over the Drain?
By placing a glass directly over the drain opening, homeowners create a temporary physical barrier.
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