Constructed of corrosion-resistant 316 stainless steel, this Sea-Dog louvered vent is designed to be used in conjunction with a collector box to facilitate air intake and exhaust. Designed with recessed louvers to create a flush surface area to reduce possible damage to the vent, plus prevent chafing to mooring lines, fishing lines, etc. Vent easily installs with six #6 RH fasteners (not included). Made for long-lasting use and durability. 16-3/8"L x 2-7/8"W x 7/8"D.