The 7.25 in. x 13 in. Ideal Pet Medium Ruff Weather Wall Kit is an optional accessory designed to be used with the 7.25 in. x 13 in. Ideal Pet Medium 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 Medium 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 Medium Ruff Weather pet door. Our simple instructions will walk you through the installation process with the greatest of ease.