Feature:1. Durable: The mushroom shaped vent is made of marine grade stainless steel material, which is not easy to rust. Even if it is in close contact with water for long, it will not be damaged and can be used for a long time.2. Widely Applicable: Mushroom shaped vents are widely used, usually for ventilation of ship's gangway doors, cockpit, cabin, or for household sheds or additional facilities.3. Easy Installation: The vent can be installed directly without the need for professional tools, and can be completed in a short time. When closing, block the water outside the door and add mosquito nets and internal plastic decorative rings.4. Bidirectional Opening: The opening direction is not fixed and is a variable opening. It is very convenient to use an integrated knob to open from the outside or inside.5. Ventilation and Heat Dissipation: The main function of the ventilation opening is to quickly discharge high temperature and turbid gases within the cabin, reducing the temperature inside the cabin and preventing moisture from entering.Specification:Item Type: Mushroom VentProduct Diameter: 175mmMaterial: Stainless steelFitment: Installs quickly and easily. Keep water out when closed, yet incorporating a mosquito mesh and an internal plastic finishing ring.Package List:1 x Mushroom Vent1 x Shim1 x Plastic Screw Handle