Description Attwood Stainless Steel Hull Louvered Vent Attwood hull-mounted vents are designed to install by fastening as a complete unit from either inside or outside the hull. Ventilation hose (not included) twists into the bottom of the box to form a raised water barrier. Plastic vents are corrosion-resistant and will not discolor. All collector boxes and vents are designed for intake or exhaust and meet ABYC H-2 cross sectional area requirements. Requires collector box 1487A for 3″ system, or 1487B for 4″ system. All-welded #304 Stainless Steel construction with polished finish. Install with #8 fasteners. Hole size in floor or wall 10.375 x 3.375 Overall vent size 11.375 x 4.375 UPC:022697148858
