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Installing a pet flap on your French or patio doors is a great option if you have cats or dogs. It lets them go in and out without having to open up the door. There are many cat flaps available that are made to fit into uPVC or composite doors, as well as wooden doors. Some have a four-way locking system that can be set to leave only or in, or open. Installation Cat flaps can be an excellent way to let your cat go in and out of the house without opening the d