Hose Thru Vents are designed for cabin or bilge ventilation. Constructed of UV resistant injection molded ABS. For use with 3? or 4? exhaust hose. Installs with four #8 FH fasteners (not included). Avoid contact with acetone or strong solvents. A 2-13/16" B 2-7/16" C 3-11/16" Hose 3"/3-1/8" Color White