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Cat flaps allow your pet to leave and come back as they please without you needing to let them in or out. They also prevent your cat from urinating in the home. Installing a cat flap on the door panel made of upvc is a lot easier than glass doors, however it will require some expertise and the appropriate tools. Take a measurement of the door Installing a cat flap on a door can be tricky but if you choose the right type of cat flap make sure you take your time and follow the instructions provided it shouldn't