SeaMark Plastic Opening Mushroom Vent 150mm White Sealing Flange Boat Motorhome Caravan

White plastic adjustable mushroom vent designed for caravans, boats, and motorhomes. Features a smooth screw-type opening and closing mechanism for precise ventilation control. Integrated weather-resistant rubber seal ensures a watertight closure, effectively preventing mildew and condensation buildup in enclosed spaces. External diameter 150mm | Internal diameter 108mm | Height 35–75mm | Hole centres 128mm | Cut-out 110mm Ideal for marine and leisure vehicle applications where reliable moisture management is essential.