Abstract: A hubcap for a wheel is disclosed and is comprised of a generally cup-shaped member adapted to be secured to a wheel to prevent contaminants from entering the wheel bearing. The hubcap has a vent opening formed therein which has a cylindrical plug inserted thereinto and which is comprised of a bronze powder material. The cylindrical plug is impervious to water and other contaminants so that the water and other contaminants may not enter the interior of the hub cap. The cylindrical plug does permit the passage of air therethrough so that excessive pressure within the hubcap may be vented.