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Cat and dog flaps in double-glazed units make it easy for your pets to come and go whenever they want. They also help in keeping an eye on your pet when you are away from your home. It is possible to fit the cat flap onto an existing uPVC panel or double glazing glass sealed unit, however you will need a replacement piece with a hole that is pre-made. A glazier is able to do this with the proper equipment and knowledge. Easy to install A cat flap is a great