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New armor flex pet door is like no other pet door on earth. This ingenious new pet door 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. The interlocking segments pivot relative to one another to provide the horizontal rigidity required to create an airtight seal while providing vertical flexibility making it easy and safe for your pet to use. This extremely high-quality pet door is designed to be the best-made dog and cat door on the planet featuring heavy-duty aluminum frame construction high strength ABS composite flap construction and all stainless-steel hardware. The 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 door on the market new armor flex door represents 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.