How To Install A Bathroom Faucet

Step One: Turn Off Water

• First, shut off either the hot- and cold-water supply valves at the sink or the main water valve for the whole house.

Step Two: Remove Supply Lines

• Open the faucet and let any water drain out.
• Remove both hot- and cold-supply lines at the shut-off valves or the faucet using an adjustable wrench. Have a bucket or container nearby to catch any water from the lines. Keep a towel on hand for this as well.

Step Three: Remove the Old Faucet

• Not all faucets are secured to the sink the same way. Some have a large locknut from the underside of the sink, while others have a threaded rod with a nut securing it to a mounting plate on the underside of the sink.
• From the underside of the sink, loosen the nut or nuts holding the faucet in place. Now remove the old faucet by pulling it up and away from the sink.

Step Four: Prep Before Installation

• Before installing the new faucet, scrub away any dirt and mineral deposits on the sink surface that may have accumulated throughout the years.
• At this point, attach the water supply lines to the faucet. Some faucets come with supply lines already attached.

Step Five: Install Deck Plate

• Convert a three-hole sink to a one-hole sink with a deck plate. (Not all faucets include a deck plate — you may have to purchase one separately.)
• Before installing the deck plate, apply a thin bead of plumber’s putty to the bottom of the plate.

Step Six: Install the Faucet

• Insert the supply lines and the shank of the faucet through the hole in the deck plate or sink.
• From the underside of the sink assemble in order: 1. Rubber washer, 2. Brass washer, 3. Threaded locknut w/set screws. Hand tighten the threaded locknut.
• Use a screwdriver to tighten the set screws on the locknut. Work your way around the locknut tightening the screws slightly each time until they are snug.

Step Seven: Connect Water Supply

• Install the hot- and cold-water supply lines to the corresponding shut-off valve. Tighten with an adjustable wrench, but only until snug. Do not overtighten.
  • Pro tip: If the supply lines are too long, shorten the length by creating a loop in the line.

Step Eight: Turn On the Water

• Turn on hot and cold shut-off valves. Check for leaks near the valves.