What you need to know before you start

Replacing a kitchen faucet with a sprayer is a job most homeowners can do in an hour or two with basic tools. You will need to turn off the water supply under the sink, disconnect the old faucet, and install the new one by reversing those steps. The hardest part is usually working in the tight space under the sink, not the actual plumbing.

Before you buy a new faucet, measure the number of holes in your sink or countertop. Most kitchen sinks have either one hole (for a single-handle faucet) or three holes (for a faucet with separate hot and cold handles, or a faucet with a sprayer). If your sink has two holes, you have a less common setup—check your current faucet to see how it mounts. The new faucet must match your sink's hole configuration, or you will need to drill or fill holes.

Key Takeaways

  • Turn off the water supply valves under the sink before disconnecting anything, and test that the water is off by turning on the faucet.
  • The old faucet is held down by nuts under the sink; loosen these with an adjustable wrench or basin wrench, then pull the faucet up and out.
  • The sprayer hose connects to a separate outlet under the sink; disconnect it by unscrewing the coupling nut by hand or with pliers.
  • Install the new faucet by inserting it through the holes, hand-tightening the mounting nuts underneath, then tightening them fully with a wrench.
  • Connect the hot and cold supply lines and the sprayer hose to the new faucet, turn the water back on, and check for leaks at every connection.

Gather your tools and materials

You will need an adjustable wrench or a basin wrench (a specialized wrench designed to fit into tight spaces under sinks—available at any hardware store for $10 to $20). You will also need a bucket or towel to catch water that drains from the lines when you disconnect them, and a flashlight or headlamp so you can see under the sink clearly.

Have the new faucet and sprayer on hand before you start. Check that the box includes all the parts: the faucet body, the sprayer head, the hose, mounting hardware (usually nuts and washers), and supply line connectors. Some faucets come with pre-attached supply lines; others require you to screw them on. Read the instruction sheet that came with your faucet—it will show you exactly how the parts connect.

Turn off the water and drain the lines

Look under the sink. You will see two oval-shaped valves on the hot and cold water supply lines coming from the wall or floor. Turn both valves clockwise until they stop—do not force them. These are the shutoff valves, and turning them stops water from flowing to the faucet.

Once the valves are closed, turn on the faucet at the sink to release any water still in the lines. Water will run for a few seconds, then stop. This step prevents water from spraying everywhere when you disconnect the old faucet. Place a bucket under the supply lines where they connect to the faucet; a small amount of water may still drip out when you loosen the connections.

Remove the old faucet and sprayer

Reach under the sink and locate the mounting nuts that hold the faucet to the sink. These are usually large nuts (often 1/2 inch or 3/8 inch) screwed onto bolts that stick down from the faucet. Use your basin wrench or adjustable wrench to loosen these nuts by turning them counterclockwise. You may need to hold the bolt from above with your other hand to keep it from spinning. Once the nuts are loose enough, unscrew them by hand and set them aside.

Pull the old faucet up and out of the sink. It may stick slightly if there is old caulk or mineral buildup around the base—gently rock it side to side as you pull. Once the faucet is out, you will see the sprayer hose connection underneath. The hose screws onto a fitting with a coupling nut. Unscrew this nut by hand, or use adjustable pliers if it is stuck. The hose will come free. Disconnect the hot and cold supply lines from the old faucet by unscrewing the coupling nuts where they attach.

Clean the sink and prepare for the new faucet

With the old faucet out, you now have access to the sink holes. Use a cloth or sponge to wipe away any old caulk, mineral deposits, or debris around the holes. If there is stubborn caulk, a plastic scraper or old credit card works well. Do not use a metal scraper, which can scratch the sink. Wipe the area dry with a clean towel.

If your new faucet comes with a rubber or silicone gasket (a flat seal that goes between the faucet base and the sink), place it now. Some faucets use caulk instead—check your instruction sheet. If you need to caulk, use 100% silicone caulk rated for kitchens, not acrylic caulk, which can crack and shrink over time.

Install the new faucet

Insert the new faucet through the holes in the sink from above. The faucet body will slide down, and the mounting bolts will poke through the holes underneath. From below the sink, slide the washers and mounting nuts onto the bolts. Hand-tighten the nuts first so the faucet sits evenly, then use your wrench to tighten them fully. Do not over-tighten—snug is enough. The faucet should not move or rock when you push on it.

Now connect the supply lines. The hot and cold water lines have flexible hoses or rigid tubes that screw onto the faucet inlets. These are usually labeled H (hot) and C (cold), or they are color-coded (red for hot, blue for cold). Screw the hot line onto the hot inlet and the cold line onto the cold inlet. Hand-tighten first, then use an adjustable wrench to snug them—again, do not over-tighten.

Connect the sprayer hose

The sprayer hose screws onto a separate outlet on the faucet body, usually located at the back or side. This outlet is often labeled "spray" on the faucet. Screw the hose coupling nut onto this outlet by hand, then tighten it with pliers if needed. The hose should not leak when water flows through it.

The other end of the sprayer hose connects to the sprayer head, which sits in a holder on the sink deck or counter. This connection is usually already assembled when you buy the faucet, but if it is not, screw the hose onto the sprayer head following the instruction sheet. Make sure the sprayer head sits securely in its holder and does not rattle.

Turn the water back on and check for leaks

Turn both shutoff valves counterclockwise slowly to restore water pressure. Open the faucet and let water run for 10 to 15 seconds to flush out any debris from the lines. Then turn the faucet off and watch all the connections you just made: the hot and cold supply line connections, the sprayer hose connection at the faucet, and the sprayer hose connection at the sprayer head.

Look for drips or steady leaks. A small drip at a connection usually means the nut needs another quarter-turn with your wrench. Tighten it slightly and watch again. If water is still dripping after a second tightening, turn the water off, unscrew the connection, and check that the ferrule (a small metal or plastic ring inside the nut) is seated properly. Screw it back on and try again. Test the sprayer by pulling the trigger—water should spray out smoothly, and the hose should not leak where it connects to the faucet.

Frequently Asked Questions

What if the shutoff valves under my sink do not turn or are stuck?

Stuck valves are common in older homes. Try turning very gently with a wrench—do not force it, or you may break the valve. If it will not budge, you have two options: turn off the main water shutoff for your entire house (usually near the water meter or where the main line enters your home), or call a plumber to replace the stuck valve. Do not proceed without shutting off water somewhere.

Can I reuse the old supply lines with the new faucet?

Old supply lines can crack or develop leaks over time, especially if they are more than 10 years old. Most new faucets come with new supply lines, and using them is safer. If your old lines are in good condition and the new faucet does not include lines, you can reuse them, but inspect them first for cracks or mineral buildup.

The new faucet leaks from the base where it meets the sink—what do I do?

This usually means the gasket is not seated properly or caulk was not applied. Turn off the water, remove the faucet, and check that the gasket is clean and positioned correctly. If the gasket is damaged, replace it. Reinstall the faucet and explore silicone caulk around the base where it meets the sink. Let the caulk cure for 24 hours before using the faucet.

My sprayer hose is kinked and water pressure is weak—how do I fix it?

A kinked hose restricts water flow. Try straightening the hose and securing it with a clip or tie so it does not kink again. If the hose is permanently creased, you may need to replace it. Hoses are inexpensive and screw on and off easily. If the hose is straight and pressure is still weak, the problem may be a clogged aerator in the sprayer head—unscrew the head and rinse it under running water to clear any debris.

Do I need to caulk around the faucet base?

Caulking is not always necessary if your faucet came with a gasket and sits flush against the sink. However, caulking prevents water from seeping under the faucet and causing mold or damage. If you choose to caulk, use 100% silicone caulk and explore a thin bead around the base. Smooth it with a wet finger and let it cure for 24 hours before using the sink.