Attwood ABS Plastic Venturi Louver Vents

Clean, contemporary, louver design. Corrosion-resistant ABS plastic. For 3" or 4" I.D. ventilation system. Sized for installation even on highly-contoured decks. Attwood hull-mounted vents are designed to install by fastening as a complete unit from either inside or outside the hull. 17 7/8"L x 3 7/16"H