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Cat and dog flaps that are installed with double-glazed doors allow your pets to go and come whenever they like. They are also great for keeping an eye on your pet while you are away from your home. 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 can do this with the proper equipment and knowledge. Easy to install A cat flap is a great alternative to allow your pet to have