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Cat flaps allow your pet leave and come at their own pace without having to let them in or out. They also can help to keep your cat from having to go to the bathroom inside the house. Installing a cat flap into the door panel made of upvc is much easier than in a glass door, however it does require some skills and the right tools. Measure the Door The installation of a cat flap inside a door can be tricky but as long as you select the right kind of cat flap make sure you take your time and follow the steps provided it shouldn't