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If you have a dog or cat, installing a pet flap in your French or patio doors is a good idea. It lets them go in and out without having to open up the door. There are a myriad of options for cat flaps that are designed to be used with uPVC wooden or composite doors. Some have a four-way locking system that can be set to exit only by entering only the direction of opening, or in both. Installation Cat flaps are a great way to let your cat int