working drain trap.
The water seal inside the plumbing is designed to prevent sewer gases from entering your living space. If you smell a strong sewer-like odor near a sink, the cause could include a dry trap, a faulty seal, a blocked drain, or a plumbing vent problem.
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A cover may temporarily reduce what escapes through the opening, but it won’t repair the underlying issue.
If the smell is persistent, unusually strong, or present in multiple rooms, have the plumbing checked. Don’t rely on a sink cover to manage a possible sewer-gas problem.
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