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Cat flaps let your cat go inside and out as they please without you having to let them in or out. They also can help stop your cat from urinating inside the home. Installing a cat flap on a upvc door panel is much simpler than installing one in a glass door, however it requires some knowledge and the right tools. Measure the Door The installation of a cat flap in the front door is difficult however, so long as the cat flap is the right type and y