How to Install an AquaSource Lavatory Faucet

Turn the water off at the main water line. Then turn off both of the water valves under the bathroom sink. Place a bucket under the water lines.

Prop a flashlight to one side of the sink cabinet so it will light the bottom of the faucet. Unscrew the water supply lines with a pair of pliers, turning clockwise to remove from the bottom of the faucet. Also detach the water lines from the valves.

Lift the old faucet off the sink, using a thin putty knife to gently pry it up if necessary.

Pour vinegar over a rag and lay it over the faucet holes in the sink. The vinegar will soften hard water formations around the old fixture's base. Allow the vinegar to work for 10 to 15 minutes, then scrub with a plastic scouring pad. Wipe dry with a rag.

Attach the new supply lines to the valves under the sink. While you can reuse the old lines, generally it is a good idea to replace everything at once. A broken line can cost you thousands of dollars in water damage; a new supply line is less than 10 dollars.

Roll plumber's putty between your palms until you have a small rope of putty. Press the putty under and around the outer edge of the faucet. If your faucet has a gasket, skip this step.

Place the faucet onto the sink, aligning with the holes. Press down firmly so the plumber's putty seals around the edge of the faucet. Twist the mounting nuts onto the bottom of the faucet.

Screw the new supply lines onto the faucet. Use pliers to tighten gently.

Remove excess putty around the base of the faucet with a wet rag.

Turn the main water line on slowly while your helper checks for leaks. Then open the water valves under the sink, again checking for leaks.

Remove the aerator on the faucet and turn the water on. Allow to run for a few minutes to clear any debris from the water lines. Turn the water off and replace the aerator.