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If you have a dog or cat installing a pet flap inside your French or patio doors is a good idea. It allows them to enter and exit without you having to open up the door. There are a variety of options for cat flaps designed to be used with uPVC wood or composite doors. Some come with a 4-way locking system that can be set to allow exit only or in-only. Installation Cat flaps can be an excellent way to let your cat go in and out of the house without opening the door each time. This is particularl