Majestic UD4 4-Inch Uninsulated Flex Duct For Outside Air Chimney Kit, Two 42-Inch Sections Included

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Fulton Woodworking Tools 4" X 50' Ultra Flex Clear Vue Heavy Duty PVC Dust Collection Hose

Hi-Tech Duravent Ducting Hose: 4 in Hose Inside Dia., 50 ft Hose Lg, 5.5 in Bend Radius Model: 202104004050

Duravent Pelletvent Pro 4-Inch Diameter By 5-Foot Length Flex Pipe

Ipower 12-Pack 4 Inch 8 Feet Non-Insulated Flex Air Aluminum Ducting Dryer Vent Hose For HVAC Ventilation, 4 Clamps Included, White