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The addition of a cat flap to your door's panel is an important task to be handled by an experienced professional. consist of an ungainly plastic exterior that is bonded to a soft, insulation polystyrene core. These materials can be difficult to cut. It's much easier to install a cat flap into an existing glass pane, or have a new door manufactured with the hole already prepared. A Glazier can do this for you. Easy to install If you have a cat and want to let them in and out without leaving your home door panels made of upvc are an idea