Product Details Fangrui Product Details Adjustable Airflow: This 4-inch Marine Vent Cover Comes With An Adjustment Valve That Allows You To Control The Airflow As Needed, Ensuring Optimal Ventilation In A Variety Of Marine Environments Such As Rvs, Boats, And Yachts. Versatile And : Made From Premium 316 Stainless Steel, This Vent Cover Is Not Only Rust- And Sturdy, But Also Environmentally Friendly. Its Polished Finish Adds A Sleek, Modern Feel To Any Environment, Making It Suitable For A Variety Of Marine Applications. Elegant Design: Combining Functionality With Aesthetics, This Vent Cover Features Fine Workmanship And An Enhanced Look. It Is A Beautiful, Reliable Addition To Your Marine Decor That Blends Seamlessly With The Interior Or Exterior Of Your Rv, Boat, Or Yacht. Easy Installation And Maintenance: Designed For Easy Installation, This Airflow Vent Grille Can Be Mounted On Both Ceilings And Walls. Its Convenient Design Allows For Easy Removal, Making It Easy To Clean And Maintain For Long-term Use. Application Flexibility: This Adju