Diversitech 1 Gal. Airlock 181 Fiber-Reinforced, Water Based Duct Sealant Mastic

This water-based fiber-reinforced duct sealant/mastic seals low, medium and high-pressure HVAC duct systems. Meets U.L. Class 1 rating and local codes while featuring long term flexibility and strength. Use on metal heating, ventilating and A/C duct systems; as well as fiberglass duct board systems and flex duct systems.|Pro-air duct sealant UL 181|Recommended for use to 10 in. of water column pressure without the need for fiberglass mesh reinforcement|Formulated for indoor/outdoor use|Temperature range up to 212 degree F