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NovaPure™ lyophilization stoppers made from 4432/50 a premium quality chlorobutyl elastomer and laminated with FluroTec™ barrier film to help reduce particulate, limit drug interaction with the elastomer and reduce leachables. These components are provided ready to use, sterilized and 100% vision inspected via our Envision™ inspection process. This stopper configuration can be used with European and American Blowback designed vials. West item number: 19700311