Features: 1. Great Compatibility — Works on 1989-Current Dodge Cummins Diesel 3.9L, 5.9L and 6.7L. (Include: 1989~2016 Cummins 4BT 3.9L / B Series 5.9L / ISB 5.9L 6.7L / QSB 5.9L 6.7L) 2. Upgrade Design — To properly place the crankshaft seal without leaks. Installing the seal uneven can cause leaks prematurely, please make sure the job is done right with this installation tool. 3. Easier Work — Replaces OE-3824498 1338. Installs seal numbers 3937111 and 3904353 or the seal from kit 3802820 in a easier way to save your time and money. .