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If you have a cat or dog, installing a pet flap inside your French or patio doors is a good idea. It allows them to enter and exit without you having to open the door. There are many options for cat flaps that are designed to fit uPVC wooden or composite doors. Some even have a four-way locking system that can be set to leave only or in the direction of opening, or in both. Installation Cat flaps are an excellent way to let your cat into and out of your home without opening the front