FIG. 1 is a top, front, right side perspective of a wheel hub cover for rotary air coupling;
FIG. 2 is a top and back perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a back elevational view thereof;
FIG. 5 is a right side elevational view thereof, the left side elevational view being identical thereto;
FIG. 6 is a bottom, back, right side perspective view thereof; and,
FIG. 7 is a bottom plan view thereof.