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4' x 8', Transition Duct, With 2 Worm Gear Clamps, Triple Lock Design For A Better Air Tight Seal, Flame Resistant & Durable, UL Listed.
1/2x1/4 BLK Coupling
3" Univ Flapper
1-1/4x2 BLK Nipple
4x8 UL Transition Duct