The ornamental design for a connector for air-breathing apparatus, as shown and described.
FIG. 1 is a partial perspective of one side, top and front of a connector
for air-breathing apparatus showing our new design, with the pressure
regulator being shown in broken lines for illustrative operative
understanding;
FIG. 2 is a perspective view of the other side, bottom and back of the
apparatus shown in FIG. 1.