Zinc plated replacement Accu-lube dust cap for Boat or Utility trailers. This dust cap is used if your axle is an Accu-lube axle with a grease fitting on the tip of the spindle. Rubber plug easily removes to access your grease fitting this dust cap measures 1.98 inch across and will fit most 5 Lug trailer hubs. Drive in installation ensures a tight fitment in your hub. Use a 1.98 Trailer Dust Cap installation Tool for 1.98 Boat Trailer Dust Caps for simple and easy installation and removal of the cap. Using this tool, and a hammer or mini sledge will make the process a breeze.