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Installing a pet flap on your French or Patio doors is a great idea if you have pets such as a cat or dog. It makes it easier for them to go into and out without needing to open the door. There are a myriad of options for cat flaps designed to be used with uPVC wood or composite doors. Some have a four way locking system that can be set to allow exit only or in-only. Installation Cat flaps are an excellent way to allow your cat access into and out of your home without opening the front door every time. is particularly beneficial when