The ornamental design for a sealring, as shown and described.
FIG. 1 is a front view of a seal ring, the rear view being a mirror image of the front view;
FIG. 2 is a right side view of the seal ring of FIG. 1, the other side view being a mirror image of FIG. 2;
FIG. 3 is a top plan view of the seal ring of FIG. 1;
FIG. 4 is a bottom plan view of the seal ring of FIG. 1; and,
FIG. 5 is an enlarged detail perspective view of the outer circumferential surface of the seal ring of FIG. 1.
The dashed broken lines in the drawings represent portions of the seal ring that form no part of the claim. The dash-dot-dash broken lines define surface boundaries of the claim, and indicate cutoff boundaries for an enlarged detail portion view that form no part of the claim.