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Installing a pet flap on your French or Patio doors is a good idea if you have pets such as a cat or dog. It lets them go in and out without having to open the door. There are a myriad of cat flaps available to be used with uPVC wood or composite doors. Some even come with a four-way locking system that can be set to exit only or in the direction of opening, or in both. Installation Cat flaps are an excellent way to let your cat in and out of your home without having to open the front door each time. This is espe