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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.