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Installing a pet flap on your French or Patio doors is a great option if you have cats or dogs. It allows them to get in and out without having to open up 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 configured to let out only by entering only the direction of opening, or in both. Installation Cat flaps are a great method to let your cat in and out of your home without opening the front door every