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Double glazing can be equipped with cat and dog flaps that allow your pet to leave and come at their own pace. They also help keep an eye on your pet while you're away. You can install a cat flap into an existing uPVC or double glazing sealed unit. However, you'll require a replacement part that has a premade opening. This can be accomplished by a glazier with the appropriate equipment and experience. Easy to install A cat flap installed in your home is a great way to allow your pet free access to the outdoors without having you to constant