Feature: 1. Wide Application: The RV portlight window comes with a 375x175mm opening installation kit, suitable for wall with thicknesses ranging from 5‑25mm. It is suitable for boat, yacht, ship, and RV applications, providing a solution for leaky, damaged, or unsatisfactory windows. 2. Waterproof 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. 3. Heavy 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. 4. 10mm 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. 5. Internal 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°. Specification: Item Type: RV WindowMaterial: Aluminum alloy+nylon+acrylic+rubberWindow External Size: Approx. 397mmx197mm/15.6x7.8in Installation Opening Hole Size: Approx.375x175mm/14.8x6.9in Suitable for Installation Thickness :Approx. 5-25mm/0.2-1in Inside Opening Angle: 0-180°Fitment: For Boat/Yacht/Nautical/RV. The solution for your leaky, broken and unsatisfactory windows. Package List: 1 x Yacht Portlight Window1 x Fixed Clip Frame Note: 1. 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.