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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 go in and out without having to open up the door. There are several 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, in-only, or open. Installation Cat flaps can be an excellent method of letting your cat go in and out of the house without op