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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 can help stop your cat from urinating inside the house. It is easier to install a cat flap on a upvc panel than a glass one but you'll require some expertise and correct tools. Measure the Door Fitting a cat flap in the door isn't easy but if you choose the right type of cat flap make sure you take your time and follow the directions provided, it shouldn't be a problem. We will show how to trace the shape