Master Flow 4 in. Goose Neck Vent - Roof Cap in Aluminum

The Master Flow 4 in. Goose Neck Vent is designed for 4 in. round pipe or flexible duct. This vent is designed for venting appliances through your roof. It's made of high quality aluminum for durability and reliability. This vent features a heavy-duty screen that helps protect against small animals from entering your home and a damper to help prevent backdraft.