VIVOHOME 4 Inch 25 Feet Aluminum Flexible Dryer Vent Hose Air Ducting Non-Insulated with 2 Stainless Steel Clamps for HVAC Ventilation and Exhaust Pack of 1 - Amazon.com
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Aluminum 4 in. Air tight pipe and dryer vent Hood ATDAVHA4/12 - The Home Depot