Although it isn’t completely airtight, it provides a surprisingly effective temporary barrier for short vacations.
Can This Help Keep Bugs Away?
One reason many homeowners continue using this trick is the possibility of discouraging insects.
Insects such as:
Drain flies
Small cockroaches
Ants
Gnats
can sometimes enter homes through plumbing systems, particularly if drains remain unused for several days.
Covering the drain won’t guarantee complete protection, but it may reduce
the chance of pests emerging while you’re away.
Will It Prevent Bad Odors?
Sometimes.
If your plumbing is functioning properly and the P-trap still contains water, you probably won’t notice much difference.
However, if you’re planning a longer trip or your home has experienced occasional drain odors in the past, covering the drain can provide additional peace of mind.
