If you notice that the oil seal on your rotors are worn or have been leaking, it's time for a replacement. SkipperMate Marine proudly offers the USA 12" 6k Oil Seal that fits perfectly with Tie-Down style rotors. The oil seal may be small but the protection it offers is huge. It safeguards the shafts and bearings from dirt, oil, grease, and other foreign material that could damage your trailer's brakes. One of the main reasons for an oil seal failure is friction from a low level of fluids; this is called Dry Running. This event can cause blisters or cracks in your current oil seal due to the heat which will lead to leaking. It's recommended that you replace the oil seal every 2-3 years and proper installation is a must as leaks can occur if not installed correctly. If you have any questions about this part, please contact us or you can order online from SkipperMate Marine today.