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https://drinkblack5.werite.net..../adding-a-cat-flap-t
Double glazing can be fitted with cat and dog flaps that allow your pet to leave and come as they please. They are also great for keeping an eye on your pet when you are away from home. You can put in a cat flap into an existing uPVC or double glazing sealed unit. However, you'll require a new part with an opening already made. A glazier can accomplish this with the proper equipment and the right training. Easy to install