The O-ring K 74151 is a high-performance sealing element designed to complement packing ring K 74130 in the ZV40/48 engine’s auxiliary systems. Manufactured from fuel- and oil-resistant elastomer, it provides an additional sealing barrier that prevents leakage under pressure, temperature fluctuations, and vibration. By maintaining tight sealing integrity and protecting adjacent components from contamination, this O-ring supports stable operation, extends service intervals, and enhances the overall reliability of the sealing assembly.