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Suitable in double glazed units or upvc doors upto 28mm thick.Composite moulded TPR flap seal.Automatic magnetic flap closing.Self lining frames.Self drains condensation build up and moisture.4-way locking system for manual use if required.In & Out and Locked.Catwalk Superior pet doors have been designed to be maintenance free by eliminating problems often associated with pet doors such as broken flaps,broken opening and closing systems,noise and seal damage by pets,rusting screws and difficulties with large cats.To overcome these problems the cat flaps are made from high impact Polycarbonate (Makrolon) plastic from Bayer of Germany,a world leader in plastic technology.This high impact plastic is also used in the manufacture of bullet proof vests and aircraft windows.Our Glass Fitting Cat door model GUCD is designed to fit into glass.NOTE:We do not advise installation by the home handy man,this is a job for your local professional glazier.Overall size:101/2"(270mm).CutOut Size:(diameter)=245mm.