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Cat and dog flaps in double glazing make it easy for your pets to move around whenever they want. They are also great for keeping an eye on your pet while you are away from your home. 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 premade hole. A glazier is able to do this with the right equipment and training. Easy to install A cat flap installed in your home is a great option to give your pet access to the outdoors