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Installing a pet flap on your French or patio doors is a great idea if you have pets such as a cat or dog. It makes it easier for them to get into and out without having to open the door. There are a myriad of options for cat flaps that are designed to be used with uPVC composite or wooden doors. Some 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