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Installing a pet flap on your French or patio doors is a great idea if you own pets such as a cat or dog. It makes it easier for them to get in and out without you having to open the door. There are a variety of options for cat flaps that are designed to fit in uPVC, composite, or wooden doors. Some even have a four-way locking system that can be set to leave only by entering only the direction of opening, or in both. Installation Cat flaps are