Today we're going to take a look at the Fulton Drive-in Grease Cap. Has the 3.125 outer diameter. Now this grease cap will tap onto the end of your hub on your axle and it protects your wheel bearings from any dirt or debris that could get in and destroy the bearings in your axle. Now this is made of a 16 gauge steel construction. Has a nice corrosion resistant zinc plating on it. This grease cap… see more >