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ITEM #: 17355716 American Louver Balancing Damper, Radial, Galvanized steel, 8", PK2 Galvanized steel radial damper helps to control air flow through air vents. Easily adjust opening with a screw driver. Fits on diffusers with 8" neck. Package of 2. Available in 6", 8", 10", 12", and 14".