I claim the ornamental design for a eyewash adapter, as shown and described.
FIG. 1 is a perspective view of an eyewash adapter showing my new design;
FIG. 2 is a left-side elevation view thereof; the right-side being a mirror image;
FIG. 3 is a front elevation view thereof, the rear elevation being a mirror image;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a cross-sectional view thereof taken along line 6-6 of FIG. 4; and,
FIG. 7 is a perspective view showing the design in use.
The broken lines depicting a water bottle in FIG. 7 are for the purpose of illustrating environmental structure and form no part of the claimed design.