Rotational coupler

FIG. 1 is a perspective view as viewed from above the rotational coupler showing our design;

FIG. 2 is a perspective view as viewed from below thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the rotational coupler and form no part of the claimed design. The dot-dot-dash broken lines in the drawings define the bounds of the claim and from no part thereof.