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If you have a pet or a cat installing a pet flap inside your French or patio doors is a good idea. It allows them to get in and out without having to open up the door. There are a variety of options for cat flaps designed to fit in uPVC or composite doors as well as wooden doors. Some even come with a four-way locking system that can be set to exit only, in only, or open. Installation Cat flaps are a great way to let your cat go in and out of the house without op