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Installing a cat flap on your door's panel is an essential task that should be carried out by an expert. The doors usually have a flimsy plastic exterior that is bonded to a soft insulating polystyrene core. It isn't easy to cut through these materials. It's much simpler to install a cat flap in an existing glass pane or have a new door made with the hole already drilled. A glazier can do this for you. Easy to Fit If you have a cat and you want to let them in and out without ha