The closing screw, code 11.07294-0004.0, serves as a reliable sealing and fastening element used to close auxiliary openings, service ports, or inspection points within the MAN L21/31 engine. Precisely machined threads and sealing surfaces ensure secure installation and pressure-tight closure even in environments exposed to vibration, thermal cycling, and mechanical stress. Designed for repeated assembly and disassembly, the closing screw enables efficient inspection and maintenance procedures without compromising sealing performance. Its robust material properties and corrosion-resistant finish ensure durability and dependable operation throughout extended service life in marine and stationary diesel engine applications.