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Cat and dog flaps that are installed with double-glazed doors makes it simple for your pets to go and come whenever they want. They are also great for keeping an eye on your pet while you are away from your home. You can install a cat flap in an existing uPVC or double glazing sealed unit. However, you will need a replacement part with a premade opening. This can be accomplished by a glazier who has the proper equipment and skills. Easy to install A cat flap is an excellent alternative to allow your pet to have access to