The story
Another reason people cover sink drains is to discourage insects from emerging through the opening.
Certain drain-associated flies, often called drain flies, can breed in the organic buildup inside drainpipes. Other insects may occasionally enter through plumbing openings, although a sink drain isn’t the most likely route for every household pest.
A cover can create an additional physical barrier, particularly if it fits snugly over the drain.
However, it won’t eliminate insects already living in the drain or stop pests from entering through other routes, such as gaps
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