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Installing a cat flap an entrance door lets your pet to come or go whenever it wants. Follow the steps below to learn how to trace the shape, cut it with a jigsaw/hole saw and install your cat's flap. If your cat flap is equipped with a manual 4-Way lock, you can block access to wild animals as well as pests and strays. You can also store pots for your cat to nestle in. Placement A cat flap isn't only a way to allow your pet to go outside