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Double glazing can be fitted with cat and dog flaps to allow your pets to leave and come at their own pace. These are also great to keep your pet safe while you're away. It is possible to install a cat flap in an existing uPVC or double glazing sealed unit. However, you will need a replacement part with an opening that is pre-made. A glazier is able to do this with the right equipment and training. Easy to install A cat flap is a great alternative to allow your pet to have access to the outdoors without having to open and close