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Introduce your cat to the flap prior to the installation so that they can become familiar with its dimensions and shape. The flap should be opened and let them explore it from every angle. Make sure the cutout is even and square. Mark the screw holes on your door and align them with the cat flap opening - the distance between the edges should be equal. Installing a cat flap in your home is beneficial to the health and wellbeing of your pet. It allows your pet to freely move from inside to the outside without you having allow them in or out