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If you have a cat or dog, installing a pet flap on your French or patio doors is a great idea. It makes it easier for them to go in and out without having to open the door. There are a myriad of options for cat flaps that are designed to fit uPVC composite or wooden doors. Some even come with a four-way locking system that can be set to exit only by entering only, or open. Installation Cat flaps can be an excellent method of letting your cat go in and out of the house without having to open the door every