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Installing a cat flap onto a door allows your pet to come or go whenever it wants. Follow these steps to learn how to outline the shape, and then use the jigsaw or hole saw to cut it and install your cat flap. You can keep wild animals, pests, and stray cats from entering your cat flap by using a manual Four-Way Lock. It's also an excellent idea to keep some plant pots around for your cat to hide behind. can be used to keep unwanted animals out, such as rodents and cats. Some models let you lock them