Small Mill Aluminum Pet Patio Door Fits 77.6 Inch To 80.4 Inch Tall Sliding Glass Aluminum Door. It only takes a minute to install this useful patio pet panel with its draft stopping watertight seal and you can even take it with you when you move. There is no assembly required because it adjusts in height from 78 3/4" to 81 1/4" to ensure a perfect fit in any sliding glass door, either right or left opening. Your pet passes through a 5" x 7" size flap. Made of tough safety glass, it has a lockout slide and a security lock for added protection.