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If you have a cat or dog installing a pet flap inside your French or patio doors is a good idea. It makes it easy for them to go in and out without you having to open the door. There are many cat flaps available designed to fit in 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, in only the direction of opening, or in both. Installation Cat flaps can be an excellent way to let your cat in and out of the home without having to open the door every