The plug screw, code 06.08042-0142.B, is a durable closing element designed to seal threaded openings and service channels within the MAN L21/31 engine. Its precision-cut thread and carefully finished contact surfaces guarantee secure installation and leak-free performance under demanding operating conditions. Typically used to close drilling points, lubrication passages, or auxiliary ports, the plug screw allows easy access during inspection or servicing while ensuring reliable re-sealing after reinstallation. Manufactured from high-strength materials with protective surface treatment, it offers excellent resistance to corrosion, vibration, and thermal stress, supporting long-term engine reliability and operational safety.