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Cat flaps let your pet come and go whenever they want, without you needing to let them in or out. They also prevent your cat from urinating inside the home. It is much easier to put the cat flap on a Upvc panel than a glass one but you'll require some knowledge and right tools. Take a look at the Door Installing a cat flap on a door can be tricky but as long as you choose the right type of cat flap be patient and follow the steps provided it shouldn't be too difficult. We will help you mark the shape and use an jigsaw to cut the door's opening