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Cat and dog flaps in double glazing allow your pets to go and come whenever they like. They are also great to keep your pet's attention while you are away. You can put in a cat flap in an existing uPVC or double glazing sealed unit. However, you will require a replacement part that has a premade opening. This can be accomplished by a glazier with the proper equipment and skills. Easy to install A cat flap is an excellent option to allow your pet access to the outside without having to shut and open your doors