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Cat flaps allow your pet to go in and out at their own pace, without needing to let them in or out. They also prevent your cat from peeing in the house. Fitting a cat flap in a door panel made of Upvc is much easier than in a glass door, but it requires some knowledge and the proper tools. Measure the Door The installation of a cat flap inside the door can be a challenge but if you use the correct type of cat flap make sure you take your time and follow the instructions provided it shouldn't be too difficult. We will show how to trace the shape, using the jigsaw