GREAT STUFF PRO™ Gaps & Cracks Polyurethane Foam Sealant is a gun-applied, insulating foam sealant that expands up to 3 inches to take the shape of gaps, creating a long-lasting, water-resistant and fire-block seal around plumbing and electrical, in basements, attics, and more. Create greater comfort by sealing the gaps and cracks that let heat and conditioned air leak out of your home Sprays right into gaps and cracks up to 3" (25 mm) in thickness Forms a long-lasting, airtight, weather-resistant seal Adheres to wood, metal, masonry, glass and most plastics Fireblock sealant Tack free in approximately 5-15 minutes; trims in 1 hour Apply with a foam dispensing gun for precision and easier access to hard-to-reach places (sold separately) 24 oz (681 g)