The screw plug K 55043 is a threaded closure component designed for the fuel injection pump assembly of the Sulzer ZV40/48 engine. Its primary role is to securely seal designated service or access openings within the pump housing, ensuring pressure integrity and preventing leakage of fuel or lubricating fluids during operation. Engineered to withstand vibration, thermal cycling, fuel exposure, and mechanical stress, the screw plug is manufactured from durable, corrosion-resistant materials suitable for demanding diesel engine applications. Precision-machined threads ensure reliable tightening and secure seating within the housing assembly. In combination with the corresponding sealing element, the plug supports leak-free operation and protects the internal pump mechanism from contamination. By ensuring secure closure and maintaining system integrity, the K 55043 screw plug contributes to safe operation, efficient fuel injection performance, and long-term durability of the fuel system.