Bed Bath & Beyond
The Ideal ModularTM Patio Pet Door

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Two modular sections easily assemble into a full-size patio pet door with no cutting. Perfect for sliding patio doors, modular is adjustable from 77 5/8" to 80 3/8". It's made of sturdy aluminum construction and has a clear tempered safety glass. It also features a security lock and animal lock-out slide. Limited lifetime warranty. Flap opening measures 10" x 15".