"This Flagro USA Flexible Ducting is constructed of waterproof, heat- and cold-resistant fabric with enclosed wire helix for added support and air flow. U.S.A. Pipe Design Single wall, Fuel Type Propane burning, Length in. 12, Color Black, Pipe Diameter in. 12, Pieces qty. 1, Product Style Flexible ducting. Easy 2-pin connection with durable wear strip Works with Flagro USA indirect heaters, Item#s 24678, 24677, 24676, 24675, 24388, 24387, 24386 and 24535"
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