The ornamental design for a seawallcap, as shown and described.
FIG. 1 is a cap perspective view of a sea wall cap;
FIG. 2 is an end view of the sea wall cap, the opposite end view being a mirror image;
FIG. 3 is a side elevation view of the sea wall cap;
FIG. 4 is a cap plan view of the sea wall cap; and,
FIG. 5 is a bottom view of the sea wall cap.
The sea wall cap is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.
Shading shown in the figures is for illustrative purposes to show surface contours in the drawings only and forms no part of the invention.