Been a snowbird for 13 years and I have never plugged any sink drain holes. When I return in the fall I seldom find any bugs. If you have your house treated for bugs routinely you should have no problem. Plugging any drains is taking a chance because if your isolation valve starts to leak you could end up with a major water problem. A bug person once told me that bugs don’t come from drains they just go into them looking for water.
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