12 oz. White Loctite Tite Foam Big Gaps is an innovative polyurethane-based insulating foam sealant that expands to fill, seal and insulate gaps and cracks inside or out up to 3 in. It is a polymer foam based on purified and concentrated ingredients that deliver premium durability. It is easy to use and apply with its attached straw applicator and provides a quick durable seal from the elements. Use for filling larger gaps and cracks around wiring and plumbing penetrations, HVAC ductwork, basement and crawlspace drafts, sill plate and rim joists, attic hatches, under baseboards, gas line penetrations and outside water faucets.