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If you have a cat or dog installing a pet flap in your French or patio doors is a good idea. It allows them to go in and out without you needing to open the door. There are several cat flaps available designed to fit into uPVC or composite doors, as well as wooden doors. Some even come with a four-way locking system that can be configured to let out only, in only, or open. Installation Cat flaps can be an excellent way to let your cat go in and out of the