Everbilt 4 in. Dryer Vent Duct to Wall Connector EZCNHD - The Home Depot
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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