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Installing a cat flap inside a door allows your pet to go and come whenever it wants. Follow these steps to learn how to mark out the shape, then use a jigsaw or hole saw to cut it and install your cat flap. If your cat flap has a Manual 4-Way lock, you can limit access to wild animals, pests and strays. You can also keep some plant pots for your cat to nestle in. Placement A cat flap is not just a means for your pet to go out more easily,