FIG. 1 is a top elevational view of a tube coupling embodying the ornamental design constituting my invention;
FIG. 2 is a side view of the tube coupling shown in FIG. 1;
FIG. 3 is a bottom view of the tube coupling shown in FIG. 2;
FIG. 4 is a side elevational view of FIG. 3;
FIG. 5 is a left end view thereof; and,
FIG. 6 is a right end view thereof.
International Classification: 2301;