The inner part stays fixed on the spindle and the outer casing rotates with the hub
This type of seal has less wear and tear and provides better leak protection
Description
Oil Seal Replacement for Dexter 010-051-00 Grease 9K 10K GD 10-51 Trailer Axle This is for ONE (enough for one hub) oil / grease seals for Common 9,000# and 10,000# Generally Duty trailers axles, typically found with 12.25" x 3.375" drum brakes. This is a "unitized" oil seal, in the it is a "internal" seal designed to work with oil type hubs.