Pöppelmann KAPSTO® plastic screw caps provide optimal protection during production, storage and transport. The KAPSTO® standard program provides screw plugs for all common threads. Whether for metric, imperial and American threads, pipe threads or Withworth threads – we provide the perfect protection for your internal threads. Our GPN screw plugs provide provide your application with bespoke protection according to your needs. O-rings, sealing lips, sealing cones and easy-to-grip heads provide the best protection, the best possible fitting and quick installation. KAPSTO® plastic screw plugs are used in a number of industry sectors: fluid engineering, hydraulics, pneumatics, coating, vehicle construction, agricultural engineering, mechanical engineering, line production, automotive suppliers and many other sectors. Whether you are looking for something robust or providing above-average sealing characteristics, we have the right screw plugs for your every need.