The ornamental design for mixing tap, as shown and described.
This application is related to U.S. patent application Ser. Nos. 29/325,866, titled Mixing Tap; 29/325,869, titled Mixing Tap; 29/325,873, titled Mixing Tap; and, 29/325,878, titled Mixing Tap—all of which were simultaneously filed on Oct. 7, 2008.
FIG. 1 is a perspective view of a mixing tap showing our new design;