Today, we're going to take a look at the Fulton Drive-In Grease Cap. This has the 1.957 outer diameter. Now, this cap is a 22-gauge steel construction, has a nice corrosion-resistant zinc plating over the whole cap. Now, this grease cap is designed for trailer hubs with the 1.957 inner diameter. It is a drive-in installation. You just tap it in until this flange goes all the way into the hub. Now,… see more >