Clean, contemporary, louver design. Corrosion-resistant ABS plastic. For 3" or 4" I.D. ventilation system. Requires 1341 collector box for 3" system, or 1342 for 4" system. Install with #8 screws. 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.Opening Hole size: 2" x 15-3/8"
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