Designed for air intake or cabin ventilation when used in conjunction with a dorade box. Promotes passive air flow by preventing mold and mildew, and keeping boat interior smell fresh. Includes snap-on deck plate and cover for use in rough weather. Constructed of UV resistant dip molded PVC. Avoid contact with acetone or strong solvents. Color White with red interior Size 9-1/4" H x 4" Dia.