Part of coupler

[0001]FIG. 1 is a top, front, left side perspective view of a part of coupler, showing our new design;

[0002]FIG. 2 is a top, front, right side perspective view thereof;

[0003]FIG. 3 is a top plan view thereof;

[0004]FIG. 4 is a front view thereof;

[0005]FIG. 5 is a right side view thereof; and,

[0006]FIG. 6 is a left side view thereof.

[0007]Evenly broken lines depict portions of the part of coupler which form no part of the claimed design.