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Cat and dog flaps installed in double glazing make it easy for your pets to come and go whenever they want. They are also great to keep your pet safe when you are away. You can put in a cat flap into an existing uPVC or double glazing sealed unit. However, you'll require a replacement part that has an opening already made. A glazier can accomplish this with the proper equipment and the right training. Easy to install Installing a cat flap inside your home is a great