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Cat flaps let your cat go in and out at their own pace, without needing to let them in or out. They also can help stop your cat from peeing in the house. It is much easier to put the cat flap on a Upvc panel than on a glass one however, you'll need some skills and the right tools. Measure the Door Fitting a cat door in a front door can be difficult, but so long as the cat flap is the right type and you follow the directions, it shouldn't be too difficult. We will demonstrate how to