Before heading off on vacation, many homeowners place an upside-down glass over their kitchen sink drain — a trick that has spread widely online. The problem: it does not create an airtight seal and fails to address the real plumbing issue lurking inside the pipes. The actual threat is P-trap evaporation, and fixing it takes only a few minutes.
A popular hack that doesn’t seal anything
The glass-and-paper method has gained traction online as a way to keep sewer odors and insects out of the home while it sits empty. The idea looks tidy and purposeful — but a glass placed upside-down over a drain with a sheet of paper underneath does not form an airtight seal.
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