Main part 4920470, interchangeable with 3679354, this threaded plug suits Cummins ISX, QSX and X15 engines. Machined from solid high-strength steel, its standard threads create firm sealing to stop oil, fuel and coolant leakage. All sizes comply with OEM requirements for easy direct installation. With solid structure and corrosion resistance, it effectively prevents engine faults and reduces downtime, ideal for global truck and machinery repair service.