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Cat and dog flaps in double glazing make it easy for your pets to come and go whenever they want. These are also great to keep your pet safe while you're away. It is possible to fit 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 do this with the proper equipment and the right training. Easy to install A cat flap is a great o