64 OZ Duct, Fiber strong, Water Based, Premium calibre, eminent Velocity For technical & Residential Supply & Return Air Duct Use, suggested For Sealing Joints, Seams, & Duct Wall Penetrations On Metal Air Duct, suggested For Sealing Connections On bendable Duct Or Fiberglass Duct Board, Crack & Peel imperviable, Mold & Mildew imperviable, inside & outside Use, UL catalogued 181A-M/B-M, LEED Qualified.
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