Stainless Steel replacement Accu-lube dust cap for boat or utility trailers. This dust cap is used if your axle is an Accu-lube or EZ 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 inches across and will fit most 4 and 5 bolt trailer hubs. Drive in installation ensures a tight fitment in your hub. These Stainless Steel 1.98 Accu-Lube Grease Caps Fit very Snugly, so installation with a heavy hammer, mini sledge, and a 1.98 Trailer Dust Cap installation Tool is highly recommended.