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Installing a pet flap on your French or patio doors is a great idea if you own cats or dogs. It allows them to enter and exit without you having to open up the door. There are a variety of 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 exit only or in-only. Installation Cat flaps are a great way to allow your cat access into and out of your h