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Cat flaps allow your pet to move around whenever they want, without you needing to let him in or out. They also can help to keep your cat from having to go to the bathroom in the house. Fitting a cat flap in the door panel made of upvc is much simpler than installing one in a glass door, but it will require some expertise and the right tools. Measure the Door Fitting a cat flap in a door can be tricky however, as long as you choose the right type of cat