*** (This item sold as a pack of 12) *** Professional series, 4" wide mouth cap with 4" diameter aluminum pipe. Cap is equipped with removable pest screen designed to keep birds and other pests from burrowing in dryer exhaust vents. Premium airflow allows for better operating efficiency and low energy consumption. Vent hood easily mounts on brick, concrete, and siding. UV resistant plastic can be painted to match exterior. White.