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If you have a pet or a cat installing a pet flap in your French or patio doors is a great idea. It allows them to get in and out without having to open up the door. There are a variety of cat flaps available to fit uPVC wood or composite doors. Some come with a four-way locking system which can be set to exit only or in-only. Installation Cat flaps are a great way to let your cat go in and out of the house without opening the door every time. This is especially