I claim the ornamental design for a compact universal unit for tow bar, as shown and described.
FIG. 1 is a perspective view of a compact universal unit for tow bar showing my new design; the broken lines depict environmental structure for illustrative purposes only and form no part of the claimed design;
FIG. 2 is an enlarged perspective view thereof;
FIG. 3 is an enlarged top plan view thereof, the bottom plan view being identical thereto;
FIG. 4 is an enlarged side elevational view thereof; the elevational view of the other side being a mirror image thereof;
FIG. 5 is an enlarged front elevational view thereof; the broken lines encircle environmental structure for illustrative purposes which forms no part of the claimed design; and,
FIG. 6 is an enlarged rear elevational view thereof.
Tow bar having a single, centrally-located ball-and-socket joint for accommodating pitch, yaw and roll movements between a towing vehicle and a towed vehicle