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Double glazing can be equipped with dog and cat flaps that allow your pet to come and leave as they please. They also help keep your pet's attention while you're away. It is possible to install a cat flap inside an existing uPVC panel or double glazing glass sealed unit, but you'll need to replace the piece with a hole that is pre-made. A glazier is able to do this with the right equipment and the right training. Easy to install A cat flap is a great option for allowing your pet to have free acces