How to Replace a Kitchen Faucet
Swap out an old or leaky kitchen faucet for a new one with updated supply lines and a clean finish.
Step-by-Step Instructions
Turn Off the Water Supply
Locate the hot and cold shut-off valves underneath the sink. Turn both clockwise until firm to stop the water flow. Then, turn on the faucet handles to release any pressure and let remaining water drain out.
Disconnect the Supply Lines
Use an adjustable wrench to loosen the nuts connecting the supply lines to the shut-off valves. Place a bucket below to catch any water. Then, disconnect the supply lines from the faucet tailpieces under the sink.
Remove the Old Faucet
Crawl under the sink with a flashlight. Use a basin wrench to loosen the mounting nuts that hold the faucet to the sink deck. You may need to remove a sprayer hose or soap dispenser connection first. Once loose, lift the old faucet out from above.
Clean the Sink Surface
Scrape away old plumber's putty, caulk, or grime from the sink deck using a plastic scraper or razor blade. Wipe the area clean with a rag and soapy water. A clean surface is critical for a watertight seal on the new faucet.
Apply Plumber's Putty or Sealant
Roll plumber's putty into a thin rope and place it around the base of the new faucet deck plate, or apply a thin bead of silicone sealant. This creates a watertight barrier between the faucet and the sink surface to prevent leaks underneath.
Install the New Faucet
Feed the faucet supply tubes through the holes in the sink deck from above. If your faucet includes a separate sprayer or soap dispenser, insert those through their respective holes. Make sure the faucet is aligned straight before proceeding.
Secure the Mounting Hardware
From underneath the sink, slide the rubber gasket and metal washer onto the faucet shank. Thread the mounting nut onto the shank and tighten securely by hand, then finish with a basin wrench. Do not over-tighten — you can crack the sink or strip threads.
Connect New Supply Lines
Wrap thread seal tape around the shut-off valve threads clockwise. Attach the new stainless steel braided supply lines to the valve and to the faucet tailpieces. Tighten the connections by hand first, then give a quarter-turn with a wrench.
Turn Water Back On and Test
Open the shut-off valves counterclockwise slowly. Check all connections underneath for drips with a flashlight. If dry, turn the faucet on full blast and let it run for 60 seconds. Check again for leaks and verify both hot and cold work correctly.
Clean Up and Final Touches
Wipe away any excess putty that squeezed out around the base. Check that the faucet handle moves freely and the sprayer retracts properly. Test the aerator flow. Congratulations — your new faucet is ready for daily use.
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