Prevent Water Accumulation: The 135° sloped surface directs rainwater away from door and window gaps and the sill, ensuring smooth outward and downward drainage to effectively prevent water accumulation and seepage. This keeps the sill structure dry and protects the exterior finish Rubber Waterproof Strip: Made from flexible rubber, this weather-stripping seal is waterproof, long-lasting time, and tear-resistant, offering a robust waterproof barrier; it can also be cut to any length to suit your needs Stepped Drainage: It features a scientifically engineered stepped, tiered structure with a slope that is lower on the outside and higher on the inside. This design guides rainwater and accumulated water rapidly outward along the stepped channels, achieving the dual functions of blocking water and facilitating drainage Easy To Install: Features flush mounting for quick and easy installation.——Accurately measure the depth and width of the slot: Slot depth must be at ＞12mm; slot width should be 18mm–24mm. Then press the unit directly into place Wide Application: Suitable for most sliding windows, windowsills, window frames. It adapts to gaps of various shapes and sizes. Whether you need to seal an entry door, bedroom window or sliding glass door, it meets your needs