This 4 inch Floor Drain and Vent Cover is is a durable, multi-purpose marine component designed to deliver both efficient drainage and reliable ventilation. Perfect for decks, storage compartments, and pontoon furniture, it installs easily on either fiberglass or carpeted surfaces. With a 3-3/4" vent hole diameter and a 5-1/2" overall diameter, it provides a secure, professional fit. Made from high-quality polypropylene built to withstand harsh marine environments, this cover helps reduce moisture buildup, improve airflow, and maintain a clean, finished appearance on your boat. 4 inch Boat Floor Drain and Vent Cover Provides both drainage and ventilation for marine applications Great for decks, compartments, and pontoon furniture Compatible with fiberglass or carpeted surfaces Constructed from durable, high-quality polypropylene for long-lasting performance Easy installation with four mounting screws (Screws NOT included) Exact item is pictured Made in USA!