Features: 1.High Durability: The air outlet is made of durable nylon material, durable, strong endurance, oxidation resistance, and the installation effect of the grille is more beautiful. 2.Installation Size: Air vent has a diameter of 130mm and a mounting hole size of 88mm diameter. 6 screws installation can ensure the overall stability, will not easily fall off, please confirm the size before purchase. 3.Good Sealing Performance: The back of the exhaust outlet has a removable sealing cover and sealing ring, which provides complete sealing and waterproof performance when closed. 4.Wide Applications: It can quickly repair damaged vents on your motorhome or caravan, and can also be applied to sea boats, yachts and household ventilation covers. 5.Professional Manufacturing: Air outlet covers are carefully designed and manufactured. Stable performance, easy installation and designed for applications with simple ventilation. Specification: Item Type: Round Air Vent_x000D_ Material: Nylon + rubber_x000D_ Outlet diameter: Approx. 130mm / 5.1in_x000D_ Installation hole diameter: Approx. 88mm / 3.5in_x000D_ Application: Suitable for RV yacht ship warehouse PackageList: 1 x Round Air Vent 1 x Lid