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.
Attwood hull-mounted vents are designed to install by fastening as a complete unit from either inside or outside the hull.
4-3/8 wide, 11-3/8 long, 3/4 high w/ a 7/8' neck.
Installation hole is 3-1/4 x 10-1/4
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