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In theory, covering the drain could help reduce the chance that odors or insects enter the home if the trap water dries out.
That is why the idea sounds believable. It appears to be a simple way to add a temporary barrier over the drain before leaving for a vacation.
But the problem is not the basic concept. The problem is the way the hack is usually shown.
A loose sheet of paper and an upside-down glass resting in the sink basin are not the same as a proper seal. Unless the glass fits tightly over the drain opening, the setup may do very little.
Why the Hack Falls Short
For the paper-and-glass method to work reliably, the upside-down glass would need to form a tight seal directly over the drain.
Most glasses are not shaped to seal against a sink basin. They may rest unevenly, leave gaps, or shift slightly without anyone noticing.
If air can still pass around the glass, then odors may also pass around it. That means the setup is more decorative than protective.
The sheet of paper adds another weakness. Moisture in the air can make paper damp, soft, or misshapen.
Once the paper becomes soggy, it is even less likely to help form any kind of useful barrier. It may also look unpleasant by the time the homeowner returns.
Another problem is stability. A small bump, vibration, or slight movement near the sink could knock the glass out of position.
Because the setup depends entirely on balance rather than a secure seal, it cannot be considered a reliable way to prepare drains before a long trip.
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