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Introduce your cat to the flap prior to the installation to allow them to become familiar with the size and shape. The flap should be opened and let them explore it from all angles. Make sure that the cutout is even and square. Mark the screw holes on your door and align them with the opening for the cat flap The distance between the edges should be the same. Preparation A cat flap in your home is beneficial to the health and wellbeing of your pet. It will allow your pet to move from inside to the outside without you needing to allow them in or out.