IF YOU TOW A TRAILER YOU NEED Genuine Bearing Buddy. Prevents wheel bearing failure on Boat, Snowmobile, ATV, Horse, RV and Utility trailers! Be Safe and Protect Your InvestmentELIMINATES EXPENSIVE BEARING REPACKING – Prevents costly repairs and saves time! No more need to take your bearings out every year to re-packEASY TO INSTALL All you’ll need to do is hold the Bearing Buddy against the hub with a small block of wood and drive it into place with a hammerEASILY CHECK GREASE LEVELS Grease can be added to the hub through a grease fitting. Lubricant level check quickly by pressing on the edge of the moveable piston, if it rocks the hub is properly filled