Adapt your door to give your pet freedom to come and go with the PetSafe® Installation Adaptor for PetSafe® Extreme Weather Aluminum Pet Door. If you want to install your pet door into a door that is less than 1 1/2 inches thick, this adaptor will help your pet door fit securely in place. Simply attach the adaptor on either the interior or exterior pet door frame during installation. Features Compatible Pet Door - The installation adaptor is compatible with your PetSafe® Extreme Weather Aluminum Pet Door When to Use - If you are installing your PetSafe® Extreme Weather Aluminum Pet Door into a surface that is less than 1 1/2 inches thick, use this adaptor to help your pet door fit securely in place Installation - Simply attach the adaptor to the interior or exterior of your PetSafe® Extreme Weather Aluminum Pet Door frame to install