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. All collector boxes and vents are designed for intake or exhaust and meet ABYC H-2 cross sectional area requirements. All-welded 304 stainless steel construction with polished finish. Install with #8 screws. Requires collector box 1487A for 3" system, or 1487B for 4" system.
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