The DiversiTech® 6-202-2 is a non-hardening dough-like material that's used for plugging openings in foundations or around refrigeration tube entry. It helps protect against dust, moisture, drafts, and noise. It's non-toxic, non-corrosive, and non-staining. Diversitech DiversiGum™ Sealing Compound, Slug, 2 lb Container Size Range, Solid, Gray