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Cat and dog flaps in double-glazed units make it easy for your pets to come and go whenever they like. They are also great for keeping an eye on your pet when you are away from home. It is possible to install a cat flap into an existing uPVC panel or double glazing glass sealed unit, but you will need a replacement piece with a hole that is pre-made. This can be accomplished by a glazier equipped with the proper equipment and skills. Easy to install A ca