High quality aftermarket replacement part. Stay with the brand of parts your truck came with. Precision-engineered to exact use in Mack truck and to ensure correct fit and function. This is a recommended replacement part for your original truck component. Get the Mack quality that you know. (Our quality is something you can rely on). SEAL, Front Crankshaft MACK E7. Components are tested to meet original specification requirements, for remarkable durability. Get the peace of mind that this truck part is up to the standards and specifications of Mack.