Wigwam F4707-052-OS Classic Ribbed Worsted Wool Watch Cap, Black, One Size SummerEndSale These covered openings allow air

These covered openings allow air to escape the attic

Toe-operated valve control

Used to reduce flue pipe size

Used for exhaust attic ventilation

This aluminum bar has a size of 1/16" x 3/4" x 3/4" with the length of 72"

Wigwam F4707-052-OS Classic Ribbed Worsted Wool Watch Cap, Black, One Size SummerEndSale These covered openings allow airThe F4707 classic ribbed watch cap is a great combination of warmth and simplicity, and has been a favorite of Merchant Marines for several years. Made of 100% Worsted Wool, the cap provides ultimate comfort and warmth. Color: Black Classic ribbed watch cap 100% Worsted Wool Great combination of warmth and simplicity One size fits all. Contents: 100% Worsted Wool.