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 2.717 inch across and will fit most 8 bolt trailer hubs.  Drive in installation ensures a tight fitment in your hub. For easy installation use this 2.717 Trailer Dust Cap installation Tool