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Cat and dog flaps that are installed with double-glazed doors allow your pets to come and go whenever they like. They also help keep your pet safe 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 a premade opening. A glazier is able to do this with the proper equipment and training. Easy to install A cat flap is an excellent alternative to allow your pet to have access to the outside without having to open and close your doors.