The Ideal Pet Patio Door is designed to provide your pet the freedom to enter and exit your home without your assistance. Ideal Pet Patio Doors can be installed in minutes require no changes to your sliding glass door and can be removed easily. Ideal Pet Patio Doors will adjust to fit height of your existing sliding glass door and all doors include a self adhesive bumper seal weather stripping and locking mechanism. Extra large door has a 15 x 20 inch flap size. Adjustable to fit existing sliding door heights of 93.75 to 96.125 inches. Reversible installation fits right or left hand sliding doors