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 2.441 inch across and will fit most 6 Lug trailer hubs.  Drive in installation ensures a tight fitment in your hub. Use a 2.441 Trailer Dust Cap installation Tool for 2.441 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.