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Introduce your cat to the flap prior to when it's put in place so that they get used to the size and shape. Open the flap and let your cat explore it from every angle. Make sure that the cutout is square and even. Mark the screw holes and align them with your cat flap opening. The distance between the edges should be equal. Preparation Installing a cat flap in your home is beneficial for the health and wellbeing of your pet. It will allow your pet to freely move from inside to the outside