Feature 1Wide Application: The RV portlight window comes with a 375x175mm opening installation kit, suitable for wall with thicknesses ranging from 525mm. It is suitable for boat, yacht, ship, and RV applications, providing a solution for leaky, damaged, or unsatisfactory windows. 2Waterproof and Sealed: The window frame is equipped with waterproof seals, providing a complete sealing and waterproofing performance. The glass filters out harmful UV rays while allowing light to enter, improving brightness inside the cabin. It can also be used as a ventilation window. 3Heavy Duty Aluminum Alloy: The RV window features a durable frame made of heavy duty aluminum alloy, which is treated with anodization to ensure long lasting performance even in harsh marine or outdoor environments. 410mm Thick Acrylic Glass: RV ventilation portlight window is made of 10mm thick smoke gray acrylic glass, providing both strength and durability to the overall structure. 5Internal Opening Design: The portlight window adopts an internal opening design with dual locking latches that can be opened at angles ranging from 0 to 180.Item Type:RVWindowMaterial: Aluminum alloy+nylon+acrylic+rubberWindow External Size: Approx. 397mmx197mm/15.6x7.8inInstallation Opening Hole Size: Approx.375x175mm/14.8x6.9inSuitable for Installation Thickness :Approx. 5-25mm/0.2-1inInside Opening Angle: 0-180Fitment:For Boat/Yacht/Nautical/RV. The solution for your leaky, broken and unsatisfactory windows .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x YachtPortlightWindow1 x Fixed Clip FrameNote1. Installation is slightly difficult, it is recommended to find a professional engineer to assist in the installation to get the best shopping experience.2. Please pay attention to avoid collision when disassembling and assembling.3. Please measure the size before purchase to make sure it is what you need.