Step 6 · Mount the New Faucet and Valves
Unpack your new faucet and review the manufacturer's instructions, as assembly can vary. Typically, you will first install the valve bodies. From underneath the deck, feed the threaded shanks of the hot and cold valve bodies up through the handle holes. From the top, place any included gaskets or seals and thread on the decorative handle bodies. From below, thread on the mounting washers and nuts. Hand-tighten them first, then use the basin wrench for a final quarter-turn to secure them. Next, apply a bead of plumber's putty or silicone sealant (check instructions) to the underside of the new spout's base. Insert the spout into its deck hole, and secure it from below with its mounting hardware. Finally, connect the flexible hoses from the valve bodies to the spout's tee fitting.