The ornamental design for a faucethub, as shown and described.
FIG. 1 is a perspective view of a faucet hub showing my new design;
FIG. 2 is a side view thereof, all other side views being a mirror image of the side shown;
FIG. 3 is a top view thereof; and,
FIG. 4 is a bottom view thereof.
The broken line showing portions of the claimed design is included for the purpose of illustrating a portion of the faucet that forms no part of the claimed design.