The oval flange, code 170901, is a precision-engineered connection component used in the MAN L21/31 engine to establish a secure and leak-resistant interface between piping, fluid-system components, or other associated engine connections. Its oval geometry can provide a compact and practical fastening arrangement where installation space, connection configuration, and reliable sealing are important considerations. During engine operation, the flange and its fastening arrangement may be exposed to internal pressure, vibration, thermal expansion, mechanical loads, and operating media such as lubricating oil, fuel, cooling water, or air, depending on its specific application. Accurate machining of the flange faces and fastening points, correct gasket or sealing-element installation, suitable material properties, and controlled tightening are essential for maintaining alignment and preventing leakage. Regular inspection should include checking the sealing surfaces, fastener locations, and flange body for corrosion, cracking, deformation, erosion, or other damage. By providing a stable and dependable connection, the oval flange supports controlled fluid transfer, effective sealing, safe maintenance, and reliable long-term operation of the MAN L21/31 engine.