Replaces one panel of dual-pane glass from your original sliding glass door, French door or sidelight, with a custom-made, dual-pane, argon gas-filled glass unit that has a pet door built-in (this is not a new sliding glass door) Maintains original sliding glass door frame and lock for security Endura Flap® doggie door pre-installed for ultimate weather resistance Maximum glass size: 34" wide x 92" high, flap sizes range from small to extra-large Additional stepover available for an extra charge  Suitable for cats, dogs, and severe-4 season climates Item only available in the lower 48 United States We'll need more information to complete your order.  In your Order Confirmation email, there is an Orange button with "Finish Your Order."  Click on it to answer questions about your existing glass and pet(s). Thank you! Discover the ultimate solution for your sliding glass door with the Pet Door Guys' "In The Glass" pet door. This innovative design replaces a panel of your existing dual-pane glass with a custom-made, argon gas-filled glass unit that has a built-in pet door. Experience the convenience of a pet door without ...