I'd like to seal the hole in the wall/vanity where the drain goes to. I assume there is some sort of circle cap that I could glue there.
The reason is that I feel a current of air going out of there. I am in the 4th/top floor of an small building, sometimes the air smells. I believe there is a chimney effect bringing air from the lower floors to mine.
Note: I know that's not the only crack/opening able of transporting air, however, I am just following the smell. It is faint (almost nobody else notices) so maybe if close the big holes that I can see it will go undetectable.
Please advise. thanks.