Pöppelmann KAPSTO® plastic screw caps provide optimal protection during production, storage and transport. The KAPSTO® standard program provides screw caps for all common threads. Whether for metric, imperial and American threads, pipe threads or Withworth threads – we provide the perfect protection for your external threads. Our GPN screw caps serve to protect, seal and close. Gaskets and easy-to-grip external rib enable a firm fit and quick installation. KAPSTO® plastic screw caps 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 caps for your every need.