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Cat flaps allow your pet to leave and come back as they please without you having to let them in or out. They also can help stop your cat from peeing in the house. Installing a cat flap into a door panel made of Upvc is a lot easier than glass doors, however it does require some skills and the appropriate tools. Take a measurement of the door Fitting a cat door in the front door is difficult, but provided that the cat flap is the right type and you follow the instructions, it shouldn't be too difficult. We will show you how to draw the shape,