Lower ball bearing and bearing boot for Rainbow Rexair vacuum cleaner motor repair of models D4C and D4C.SE C3 electric motor grade, double rubber (nitrile) sealed precision ball bearing is pre-greased and sealed for best protection in minimizing bearing corrosion from moisture and contaminants Use to replace model D4C and D4C.SE lower or middle motor bearing, or for model D3C lower motor bearing number R-1981 When replacing the lower bearing, it's a good idea to also replace the bearing boot (included here), as the separate rubber bearing boot becomes brittle with age, and can crack and cause vibration This double-sealed bearing is more effective in sealing out moisture and contaminants A model D4C motor schematic diagram and parts list is included. Repair instructions are NOT included.