Genuine OEM Part No. 3941472 Male Union is purpose-built for 1998-2002 Dodge Ram 5.9L trucks equipped with Cummins 6BT5.9 and 4B3.9 engines. Manufactured from high-strength, corrosion-resistant steel with precision-machined threads and sealing surfaces, it ensures a tight, leak-free connection for fuel, oil and coolant lines, withstanding high pressure and vibration in heavy-duty truck operating conditions.