The 9.75 in. x 17 in. Large Ideal Pet Ruff Weather Wall Kit is an optional accessory designed to be used with the 9.75 in. x 17 in. Large Ideal Pet Ruff Weather Door (can be purchased separately). If you desire the flexibility to install your pet door in a location other than in one of your home's interior or exterior doors, this kit allows you to install your new 9.75 in. x 17 in. Large Ruff Weather Door through a wall with the greatest of ease. Constructed of sturdy plastic, the frame will adapt to fit most standard walls and will maximize the energy efficiency of your 9.75 in. x 17 in. Large Ruff Weather pet door. Our simple instructions will walk you through the installation process with the greatest of ease.