After successful foundation of the company NILOS in the field of conveyor belt equipment, it is again mining and knowledge from practice that solve another problem: The first G-ST ring (rubber-steel flange gasket) is developed. The previously used unstable rubber ring is made stable by a steel insert. The outer diameter of the ring centers itself independently in the flange on the bolt ring. Other advantages are the spherical shape and steel insert, better sealing effect and usability for higher pressures.