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Jamestown Distributors(800) 497-0010
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Attwood Venturi Vents are designed for 3 inch and 4 inch ventilation systems. Made from ABS plastic, these vents can be placed where needed and will not corrode. Venturi vents require 1341 collector box for 3 inch system, or 1342 for 4 inch system. Sized for installation and attaches with #8 screws. Size: 17-9/16" Length X 2-3/4" Height X 11/16" Width.
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Exact replacement for 1991 Four Winns 18'6"
I bought two at the same time (for the two sides of my boat) and for some reason they shipped in separate boxes a couple of days apart. Not really a problem but they could have saved some money by shipping them together.
The vents fit my 1994 Chaparral 1930 like OEM parts