Plumbing fitting

FIG. 1 is a right, top, front perspective view of a plumbing fitting according to an embodiment of my new design;

FIG. 2 is a right side elevational view of FIG. 1 ;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof, the rear elevational view thereof being a mirror image of the front view shown; and,

FIG. 5 is a top plan view thereof, the bottom plan view thereof being a mirror image of the top view shown.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.