HEAVY DUTY ENERGY EFFICIENCY: Endura Flap thermo panel features an energy-efficient design with tempered safety glass, magnetic sealing dual-layer flap, and heavy-duty aluminum frame, providing excellent insulation and durability for pet owners; large flap measures 10" x 19" and is suitable for pets up to 27" tall DESIGNED FOR SLIDING GLASS DOORS: the pet door secures into the track of your existing sliding glass door, requiring a track width of at least 1"; large pet door will require up to 14-1/4" width in your slider, allowing you to continue using your sliding glass door normally VERSATILE INSTALLATION: available in 3 different height ranges, with a sliding installation mechanism to accommodate various door models, the thermo panel is quick and easy to install, ideal for renters and vacation homes without requiring the need for permanent installation DURABLE AND SECURE: the Endura Flap thermo panel includes a heavy-duty molded ABS locking cover and C-Clamp Lock, ensuring safety and control when needed, while allowing your pets the freedom to enter and exit as they please; for additional security, pet owners can consider using a charley-bar to fix the sliding door in place LIFETIME GUARANTEE: Endura Flap pet doors are proudly built in the USA, using high quality materials, and backed by a lifetime warranty; experience worry-free satisfaction for you and your pet The Endura Flap Thermo Panel 3e offers a practical and efficient pet door solution for sliding glass doors. This product features an easy-to-install design that seamlessly integrates into your sliding door's inside track, requiring no permanent alterations. This makes it especially suitable for rental properties or temporary residences. Crafted for durability and functionality, the Thermo Panel 3e boasts a heavy-gauge aluminum frame, ensuring strength and longevity. The inclusion of Low-E glass in the panel enhances energy efficiency by reducing infrared and ultraviolet light exposure, an essential feature for maintaining a comfortable home environment. This pet door offers adjustable heights and can be custom-sized to fit a variety of sliding glass door models, accommodating tracks that are at least 1" thick. This versatility is complemented by a choice of colors - white, black, and brushed aluminum - allowing you to match the pet door to your home's interior design seamlessly. The Endura Flap Thermo Panel 3e is designed with your pet's comfort and safety in mind. The polyolefin polymer flap is built to withstand extreme temperatures, as low as -40°F, and includes a magnetic closure on three sides for enhanced weather resistance. The adjustable step-over height enables you to tailor the pet door to your pet's size, ensuring their ease of use.For security, the product includes a heavy-duty molded ABS locking cover and a C-Clamp Lock, providing peace of mind when additional safety measures are needed. The Thermo Panel 3e is highly rated by pet lovers for its exceptional insulation, durable construction, and the freedom it offers pets to move in and out at will. To support your investment, the product comes with a lifetime warranty and US-based customer support. Pet door panel includes a center post draft stopper and foam weather stripping. Adjustment range fits slider heights between 93.25" - 96.25".