The O-ring K 74150 is a precision sealing element designed for the casing of the fuel transfer pump K 74102 in the ZV40/48 engine. Manufactured from high-grade elastomer resistant to fuel, temperature fluctuations, and mechanical stress, it ensures a tight, leak-free interface between pump casing components. By preventing fuel seepage and protecting the interior from contamination, K 74150 safeguards pump efficiency, extends service life, and supports consistent fuel delivery. Its small size belies its importance, as this O-ring plays a vital role in maintaining the integrity and safety of the entire fuel transfer system.