10,000 HD-15,000 lb, Dexter Axle replacement oil seal. Used in oil bath axles - not designed for grease applications. This is a unitized seal, which means the inner part will stay fixed on the axle spindle and the outer part rotates with the hub. This design prevents wear and tear on the seal and gives better leak protection than other designs. - Outside diameter: 4.500" - Inside diameter: 3.125" - Width: 0.595" - Used on Dexter 10,000 Heavy Duty 12,000 and 15,000 lb axles - Used on AL-KO 10,000 Heavy Duty 12,000 and 16,000 lb axles - Used on Rockwell American (Quality) 12,000 and 16,000 lb axles