Many times when we assist others with front suspension parts, invariably we are told that the car once apart, did not have this installed!!!!! Well, if you open up your and check out your front hub components and there is no oil seal, I'll bet your bearings are shot as well. This lovely felty ring helps keep your bearing grease from flowing out the back side. We can't have that now can we? DO NOT GREASE IT WHEN INSTALLING!