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Double glazing can be fitted with flaps for dogs and cats to let your pet come and leave at their own pace. They also help keep an eye on your pet while you are away. It is possible to install a cat flap in an existing uPVC or double glazing sealed unit. But, you'll need a replacement part with an opening already made. A glazier can accomplish this using the appropriate equipment and the right training. Easy to install A cat flap installed in your home is a great