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The addition of a cat flap to your door panel is a crucial task that should be carried out by an expert. The doors are typically made of a plastic exterior that is bonded to an insulation-enhancing, soft polystyrene base. These materials are often difficult to cut. It's much simpler to install a cat flap into an existing pane of glass, or have a new door constructed with the hole already made. A glass glazier can help you