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https://www.openlearning.com/u..../gallegosbak-smmzk2/
Professionals should handle the installation of a cat flap on your door panel. These doors are usually made of a thin plastic exterior, which is then bonded to an insulating, soft polystyrene core. These materials can be hard to cut. It is much simpler to install the cat flap inside an existing glass pane or to make the hole in a new door. A glass glazier can help you. Easy to Fit If you have a cat and you want to let them in and out without