The ornamental design for an exposed shower fixture, as shown and described.
FIG. 1 is a perspective view of an exposed shower fixture showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is another perspective view of the exposed shower fixture showing the shower pole comprises three pieces and the top piece is in an extended position thereof.
The broken lines in the drawings depict part of the exposed shower fixture that form no part of the claimed design.