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Provide passive ventilation for your cabin by reducing stagnant air, mold and mildew without opening a hatch. Fully adjustable with a manual knob. Translucent center provides additional light down below. O-ring and gasket prevent water ingress. Trim piece provided for thru deck installations. 4" hole required. Constructed of injection molded nylon with a formed 304 stainless steel cover. Includes all necessary hardware for installation.