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If you have a cat or dog installing a pet flap on your French or patio doors is a great idea. It lets them go in and out without having to open the door. There are for cat flaps designed to fit uPVC wood or composite doors. Some come with a four-way locking system which can be set for exit only or in-only. Installation Cat flaps can be an excellent method of letting your cat go in and out of the house without ope