Duct Seal 321 Duct Sealant | DS-321-4

Duct Seal 321 Duct Sealant DS-321-4 is a top-quality one-gallon duct sealant designed for industrial duct sealing applications. This gray UL181B-listed sealant is suitable for indoor and outdoor use on metal ducts, glass fiber duct boards, and flex ducts. With UV inhibitors and built-in fiber reinforcement, it offers durability and long-lasting performance. Non-toxic and solvent-free, this duct sealant comes in a lot quantity of 4, providing ample coverage.