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Cat and dog flaps in double glazing 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 home. It is possible to install the cat flap onto an existing uPVC panel or double glazing glass sealed unit, however you'll need to replace the piece with a hole that is pre-made. A glazier can accomplish this using the appropriate equipment and knowledge. Easy to install A cat flap is a great option to allow your pet to have free access to the outdoors