Abstract: A plug for a hubcap includes a base configured to fit into and obstruct a port of a hubcap. The base at least partially defines a cavity therein. The plug also includes a cap extending radially outward from the base. The cap defines an opening therein, the opening extending at least partially radially, and a passage extending axially between the opening and the cavity. The opening is in fluid communication with the cavity via the passage.

Abstract: A plug for a hubcap includes a base configured to fit into and obstruct a port of a hubcap. The base at least partially defines a cavity therein. The plug also includes a cap extending radially outward from the base. The cap defines an opening therein, the opening extending at least partially radially, and a passage extending axially between the opening and the cavity. The opening is in fluid communication with the cavity via the passage.

Abstract: A hub cap vent plug which is resistant to penetration by water sprayed under high pressure during vehicle washing. The plug includes an axially outer end face portion, sidewall portions adapted to mate in fluid-tight relation with an opening in an associated hub cap, and a small diameter opening terminating at one of its ends in a thin web of the plug material. The plug has a valve cover with an inner surface spaced closely apart from said end face portion, thereby defining a pair of transverse openings. A normally closed valve such as a slit in the web allows pressure and vacuum to vent through the valve.