There is a hole (about 2-3" in diameter) on my basement wall to exterior for running out the AC coolant line and a few satellite cables. I used insulation fiberglass to fill it, but still lot of cold air comes through in winter. What is the best stuff can be used to seal this hole? I guess some kind of putty may be good? Sometime I may need to re-open it up to add a cable or wire.
Thanks,
John