About this item - Freedom & Security: Give your pet the independence to go in and out while you control access with the built-in lock. Our extra large dog door fits sliding doors, allowing pets to pass freely while keeping your home secure. - 3-Flap Insulation: The triple-flap design provides superior insulation against extreme temperatures and drafts, keeping your home comfortable and energy-efficient. Ideal for harsh weather conditions. - Durable Construction: Made from laser-welded steel and aluminum alloy, this pet door is rust-resistant, sturdy, and built to last. Suitable for multi-pet households with pets up to 220 lbs. - Easy Installation: Fits wood, PVC, and metal doors 1.2" to 2" thick. Comes pre-assembled with templates and instructions for a hassle-free setup. Includes a metal closing panel for added security. - Customer Support: We stand behind our product. If you have any questions, our team is ready to assist you promptly.