This High Tech Pet XL Complete Pet Door Kit with Wall Tunnel features a revolutionary, patent pending flap design that creates an airtight seal, providing the highest level of extreme weather resistance and energy efficiency. The innovative new flap design is made of individual, interlocking segments, each precisely positioned by rare earth magnets. This extremely high-quality pet door is designed to be the best made dog and cat door on the planet. The dog door is finished with the toughest industrial powder coat to look beautiful and work perfectly for years and years. Compared to the next best pet doors on the market, new Armor Flex doors represent a big step forward in quality, innovation and technology with lower pricing to give you, not just the best pet door, but the best VALUE anywhere. Check out our door mount, wall mount and our ultra-high quality, double glass, Low-E patio door mount models.