The ornamental design for a fitting for connecting a-frame barriers, as shown and described.
FIG. 1 is a left, top, front, perspective view of a fitting for connecting a-frame barriers showing my new design;
FIG. 2 is a front elevational view thereof taken, it being understood that a rear elevational view is a mirror image thereof;
FIG. 3 is a left end elevational view thereof taken from the left side of FIG. 2;
FIG. 4 is a right end elevational view thereof taken from the right side of FIG. 2;
FIG. 5 is a top elevational view thereof taken from the top of FIG. 2; and,
FIG. 6 is a bottom elevational view thereof taken from the bottom of FIG. 2.
It is to be understood that any portion of any figure shown in: broken lines and phantom lines are for environmental purposes only and form no part of the claimed design; and portions of the claimed design are shown separated and bound by a bracket to indicate that no particular length is being claimed.