Features: 1. Function: Designed to remove and install both front and rear crankshaft oil seals for Detroit Diesel DD13 DD15 engines. This is a special made professional tool kit that can easily and quickly replace seals without do any damage to both seals and crankshaft. 2. OEM Replacement: Directly replace OEM part number W541589023300 and W470589004300. This is a master set that include all components to replace the seals, include a new installation ring (W541589003400) for newer models DD13 DD15 engines. .