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Adding a cat flap to your door panel is an essential task to be handled by an expert. These doors are usually made of a plastic exterior, which is then bonded to an insulating, soft polystyrene core. It can be difficult to cut through these materials. It's much simpler to install a cat flap into the glass pane that is already in place or have a brand new door made with the hole already drilled. A Glazier can do this for you. Easy to Fit If you have a cat and would like to let them in and out without leaving your home door panels made of upvc are a great solution.