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If you have a cat or dog installing a pet flap inside your French or patio doors is a great idea. It makes it easy for them to get into and out without having to open the door. There are many cat flaps available to fit uPVC composite or wooden doors. Some even have a four-way locking system that can be configured to let out only, in only the direction of opening, or in both. Installation Cat flaps are an excellent way to let your cat go in and out of the house without having to open the door ev