The nut coded K 27209 is a small but essential fastening element in the fuel injection system of the ZV40/48 diesel engine. Specifically designed to secure the fuel injection valve in place, this nut ensures a tight and stable connection capable of withstanding extreme pressure and vibration during engine operation. Made from high-grade, corrosion-resistant steel, it maintains the structural integrity of the fuel delivery system and plays a critical role in preserving injection precision, combustion efficiency, and long-term engine reliability.