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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 allows them to get in and out without having to open the door. There are several options for cat flaps that are designed to fit into uPVC or composite doors as well as wooden doors. Some even have a four-way locking system that can be configured to let out only or in the direction of opening, or in both. Installation Cat flaps are a great way to let your cat go in and out of the house without having to open the door