Fits Caterpillar Pipelayers: 572R, 572R II, 578, 583R, 587R, 7A, 7S, 7SU, 7U. 1T0699, 1T-0699, 4L1455, CLU40-0232. It fits within the torque converter assembly, where engine power is multiplied and transferred to the transmission and drivetrain.