4 Inch Gray Duct Hose by 12 Feet, Eau Flexible 4-Layers Aluminum Dryer Vent Tube Transition Duct Air Hose with 2 Screw Clamps Great for HVAC Duct, Clothes Dryer Duct, Air Duct:
Everbilt 4 in. x 8 ft. Flexible Aluminum Dryer Vent Duct BTD48HD - The Home Depot
Rubber-Cal 6 in. I.D. x 25 ft. HVAC Ventilation-Flexible Duct 01-225-6 - The Home Depot