How to replace your slide-out top seal: 1. Ensure that the surface of the RV slide-out window is clean, dry, and free from any dirt or residue. 2. Measure and cut to the desired length of seal you need for your slide-out room. 3. Secure the seal in place using appropriate tools for a secure fastening and complete sealing. 4. Slide the D-seal into track channel located on the RV's frame around 5. For the best hold, please use flat head screws or staples to fix the D-seal, especially at the ends. RV Slide Out Seal Set: 2 in 1 combo rv slide out seal set ingeniously combines the 018 - 341 EK Seal Base and the 018 - 312 EKD D - seal, prevents water or debris from entering your living space. If you are needing to replace broken and worn-out trim molding this rubber bulb seal is just what you need. Dimensions: Please measure your existing seal’s width & height – if they match the numbers above, this set will fit. D- seal: 35' long x 1" wide x 15/16" tall. Seal base: 35' long x 2.75" wide. Upgraded Adhesion and Heat - Resistance: The seal base's adhesive has a super - sticky formula, making it ideal for use in diverse climates. The seal incorporates high - strength EPDM rubber, which is flexible, wear - resistant, and weather - resistant. Easy Installation: Clean the mounting surface then fixed the seal base. Slide the D-seal into track channel located on the RV's frame around, then use scissors to trim the extra seal. What You Get: Rv slide out D-seal, rv slide out seal base, manual, and friendly customer service. Every item is factory - inspected to handle RV use, giving you a long - lasting sealing solution.