Feature: 1. Wide Application: Porthole window is suitable for for boat, yacht, ship, and RV, and can be used for your boat yacht RV conversion retrofitting and other projects. 2. Weather Resistant:The entire frame of the escape window is made of heavy duty aluminum alloy polished to a smooth finish, ensuring no erosion even in harsh marine sessions or outdoor environments. 3. High Light Transmission: The anthracite glass filters out ultraviolet rays while ensuring that light can enter the compartment, enhancing the brightness of the cabin, and can also be used for ventilation windows. 4. Safe and Reliable: Support rods and opening and closing handles to ensure that the window can be opened quickly and safely in case of emergency, providing multiplied escape space and access. 5. Ideal Replacement: Fine craftsmanship, this is your ideal option and replacement for your original damaged and old flange, which is perfect for your nautical RV. Specification: Item Type: Rectangular Porthole WindowMaterial: Aluminum alloy + tempered glass + ABS + rubberSwitching Method: External push type, with stainless steel support rod and fixed handle Window Size: Approx. 475 x 475mm/18.7x 18.7in Installation Opening Size: Approx. 410 x 410mm/ 16.1x 16.1in, R45-4 Suitable for installation thickness: Approx. 33-55mm/1.3 to 2.2inFitment:For Boat Yacht Nautical RV For projects such as retrofitting your boat yacht RV for leaking, broken and unsatisfactory windows. Package List: 1 x Rectangular Porthole Window Note: 1. Installation is a little difficult, it is recommended to find a professional engineer to assist in the installation to get the best shopping experience.2. Provide sturdy packaging to ensure that the sunroof is delivered to you in new condition, please pay attention to avoid collision when disassembling and assembling.3. Please measure the size before purchase to ensure that it is what you need.