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If you have a dog or cat, installing a pet flap inside your French or patio doors is a great idea. It allows them to enter and exit without you having to open the door. There are a myriad of cat flaps available to be used with uPVC composite or wooden doors. Some have a four-way locking system that can be configured to let out only or in the direction of opening, or in both. Installation Cat flaps are an excellent way to let