Aerator

FIG. 1 is a top isometric view of an aerator showing my new design. FIG. 2 is a bottom isometric view thereof. FIG. 3 is a front elevational view thereof; the rear, right side, and left side elevational views are identical. FIG. 4 is a top plan view thereof. FIG. 5 is a bottom plan view thereof; and, FIG. 6 is a cross-sectional view thereof along line 6 - 6 in FIG. 4 . The dashed lines in the figures depict unclaimed environment only and form no part of the claimed design.