We claim the ornamental design for a plumbing fixture, as shown and described.
FIG. 1 is a left, top, front perspective view of an embodiment of the claimed design;
FIG. 2 is a top plan view of the claimed design of FIG. 1;
FIG. 3 is a front elevation view of the claimed design of FIG. 1;
FIG. 4 is a left-side elevation view of the claimed design of FIG. 1, the right-side elevation view being a mirror image of the left-side shown;
FIG. 5 is a rear elevation view of the claimed design of FIG. 1;
FIG. 6 is a bottom plan view of the claimed design of FIG. 1;
FIG. 7 is front sectional view taken along line 7-7 of FIG. 2; and,
FIG. 8 is a side sectional view taken along line 8-8 of FIG. 2.
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. Any dash-dash broken lines in the drawings are for the purpose of illustrating unclaimed surfaces or environment of the design. Any dot-dash-dot broken lines in the drawings are for the purpose of defining unclaimed boundaries of the design.