I claim the ornamental design for a vibration clamp for a ring seal, as shown and described.
FIG. 1 is a perspective view of a vibration clamp for a ring seal showing my new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a side elevational view thereof.
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
In the drawings, the broken line showing of a ring seal, a second clamp, and a valve depicts environmental subject matter only and forms no part of the claimed design.