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Double glazing can be equipped with cat and dog flaps that allow your pet to leave and come at their own pace. These are also great to keep your pet's attention while you're away. It is possible to install the cat flap onto an existing uPVC panel or double glazing glass sealed unit, but you will need a replacement piece with a premade hole. A glazier is able to do this with the proper equipment and knowledge. Easy to install Installing a cat flap inside your home is a great way to give your pet access to the outdoors without the need for you to open