FIG. 1 is a perspective view of a faucet; FIG. 2 is a front elevational view; FIG. 3 is a rear elevational view; FIG. 4 is a top plan view; FIG. 5 is a bottom plan view; and, FIG. 6 is an elevational view, as viewed from the right and left side. The broken lines in all views are for the purpose of illustration and are not part of the claimed design.