N.K. Engineering Co. Manufactures Stainless Steel Ropp Cop Sealing Machine. N.K. Engineering Co. Is the manufacturer and exporter of machinery for the pharmaceutical industry. Stainless Steel Ropp Cop Sealing Machines are available with single motor synchronizes conveyor, star wheels and platform turret whose speed can be varied by the % speed pot on operating panel. A special clutch device is incorporated on the in-feed worm and Star wheel system for stoppage of machine in the event; they are over turned or over diameter.