FIG. 1 is a perspective view of an air pump housing showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of an air pump housing showing a second embodiment of my new design;

FIG. 9 is a front view of FIG. 8;

FIG. 10 is a rear view of FIG. 8;

FIG. 11 is a left-side view of FIG. 8;

FIG. 12 is a right-side view of FIG. 8;

FIG. 13 is a top view of FIG. 8; and,

FIG. 14 is a bottom view of FIG. 8.

The broken lines are for purposes of illustration only and do not form a part of the claimed design.