Main part 3913759 flexible hose can be substituted by 3903658 and 3909546, for Cummins 4B3.9, QSB, 6B5.9, B3.3, B4.5, 6C8.3, NH NT855 and ISBE engines. Flexible yet tough, it absorbs vibration stress on fluid pipelines. Oil?proof and heat?proof properties extend service life across multiple engine platforms.