We claim the ornamental design for a mixer tap, as shown and described.
FIG. 1 is an isometric front view of a mixer tap showing our new design;
FIG. 2 is an isometric rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown are included for the purpose of illustrating a portion of the mixer tap that forms no part of the claimed design.
The shading lines shown in the drawings represent the approximate three-dimensional contour of the design, and are not intended to indicate surface decoration.