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Double glazing can be fitted with cat and dog flaps that allow your pet to leave and come at their own pace. These are also great to keep your pet's attention while you're away. You can put in the cat flap inside an existing uPVC or double glazing sealed unit. However, you will need a replacement part with an opening that is pre-made. This can be done by a glazier who has the proper equipment and skills. Easy to install Installing a cat flap inside your