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181 DUCT SEALANT - 1 Gallon
 
FIBER REINFORCED, WATER BASED mastic that is ideal for use on all types of metal ductwork, flex duct, and fiberglass duct board.  181 Duct Sealant is fiber reinforced and non-flammable in both wet and dry states.  This versatile formula can be used indoors/outdoors, and on low to high-velocity systems.