The Great Stuff™ Gaps & Cracks Foam Sealant Kit reduces unwanted airflow and improves energy efficiency all around the home. Gaps & Cracks expands to fill openings, creating long-lasting, fire-rated seals around plumbing and electricity penetrations, duct work, sill plates, and rim joists. Just pop the top off the can; screw it on the gun; press the trigger and you are good to go!