How to Replace a Kitchen Faucet

On this page (9 sections)

1. What should you check before kitchen faucet replacement?
2. How do you shut off the water safely?
3. How do you remove the old kitchen faucet?
4. How do you clean the sink deck after removal?
5. How do you install the replacement faucet?
6. How do you reconnect the water supply?
7. How do you flush and test the new faucet?
8. What should you do if the faucet leaks?
9. When is kitchen faucet replacement complete?

Kitchen faucet replacement starts with shutting off the water, disconnecting the old supply lines, removing the mounting hardware, and installing the new faucet according to its instructions. Finish by running both hot and cold water, checking every joint, and looking for leaks under the sink.

Before buying a replacement, check the sink hole layout and the space below the counter. A kitchen faucet buying guide can help you compare faucet types, mounting styles, and the clearances that matter.

What should you check before kitchen faucet replacement?

Confirm the new faucet matches the sink holes and has enough room for its connections. Count the holes, measure their spacing, and inspect the area below the sink for shutoff valves, supply lines, and mounting hardware.

A single-hole faucet can work with some larger sink layouts when a suitable deck plate covers the extra holes. For unused openings, a kitchen faucet hole cover may be the right solution.

A deck plate can also cover multiple sink holes beneath a faucet. Compare a kitchen faucet deck plate or a stainless steel kitchen faucet plate if the finish and hole layout need to match.

Gather an adjustable wrench, a bucket or bowl, towels, a flashlight, a cleaning cloth, and the faucet instructions. An under-sink tool can make the mounting nut easier to reach.

How do you shut off the water safely?

Close both hot and cold shutoff valves before disconnecting anything. Turn each valve clockwise until it stops, then open the faucet to release pressure from the lines.

Place a bowl under the connections before loosening them. A small amount of trapped water can drain from the supply lines even after the valves are closed.

If water continues flowing, close the home's main water supply only if you know where it is and can restore it safely. Do not proceed with the faucet removal while a supply line is still pressurized.

How do you remove the old kitchen faucet?

Disconnect the supply lines first, then remove the mounting nut or bracket under the sink. Support the faucet from above while loosening the hardware below so it does not twist against the sink deck.

Use a wrench that fits the connection without rounding it. Keep a towel under the joint and label hot and cold lines if their positions are not obvious.

After the supply lines are disconnected, loosen the mounting hardware. Older hardware may be tight because of corrosion or limited access, so work slowly and keep the tool aligned with the nut.

The KLEIN TOOLS 68098 12-in-1 Faucet Wrench, Plumbing Multi Tool has a tab mount wrench for 2-, 3-, 4-, and 6-tab mounts. Its open hex wrench fits 5/8 in, 3/4 in, 7/8 in, and 15/16 in hex nuts, and it extends up to 14-1/2 in for tight spaces.

Choose it when you need one tool for faucet, sink, and toilet installation or repair tasks. Its detachable metal piece includes a 4-slot strainer wrench and an aerator wrench for junior-sized aerators.

The KLEIN TOOLS wrench uses a nylon body and has a 3/8 in square drive connection with a screwdriver passthrough. It is a focused choice for readers who want several plumbing wrench functions in one tool.

How do you clean the sink deck after removal?

Remove old sealant, mineral buildup, and loose debris before placing the replacement faucet. The mounting surface should be clean and dry so the new base or gasket can sit evenly.

Use a cloth and a suitable cleaner for the sink material. Avoid scraping in a way that could damage the finish, and remove debris from around the faucet holes before checking the fit.

Dry the surface completely. If the new faucet uses a base plate, place it according to the faucet instructions and confirm that it covers the required holes.

How do you install the replacement faucet?

Feed the faucet lines through the sink opening, position the faucet, and tighten the mounting hardware from below. Keep the faucet aligned while tightening so the spout faces the sink and the base sits flat.

Install any gasket, washer, bracket, or plate in the order shown by the faucet instructions. Hand-tighten first, then use the correct wrench for the final tightening.

Do not overtighten plastic parts or force a mounting nut at an angle. Excess force can damage the hardware or make future removal harder.

If you have a Moen faucet, check which Moen kitchen faucet mounting kit suits the mounting arrangement. You can also compare the correct Moen kitchen faucet base plate and Moen kitchen faucet mounting bracket before tightening the faucet in place.

How do you reconnect the water supply?

Connect the hot and cold lines to the matching shutoff valves without crossing or sharply bending them. Make sure each connection starts straight and that the sealing method matches the faucet instructions.

Tighten threaded connections firmly, but do not use force beyond what the instructions allow. Keep the lines clear of cabinet edges and moving storage so they are not pulled after installation.

Open each shutoff valve slowly while watching the connection. If a joint begins to seep, close the valve, release pressure, and check the alignment and sealing parts before trying again.

The RIDGID 57003 EZ Change Plumbing Wrench Faucet Installation and Removal Tool has a 6-sided insert for 5/8 in, 3/4 in, 7/8 in, 15/16 in, and 1 in nuts. Its handle accommodates common 2-, 3-, 4-, and 6-tab basin mounting nuts.

Its cylindrical insert includes a 5/8 in deep-well socket for single-hole mountings. The reinforced plastic body and aluminum inserts are designed for tight under-sink spaces, while the open handle slot clears supply lines.

Choose RIDGID when you want broader nut-size coverage, including 1 in, or when the mounting nut and supply lines are difficult to reach. Its 10.5 in length and 16 oz weight make it a practical option for under-sink work.

How do you flush and test the new faucet?

Open the faucet slowly, flush the lines, and inspect every connection for leaks. Run cold and hot water separately, then check below the sink while the water is flowing and again after the cabinet area dries.

Remove the aerator first only if the faucet instructions recommend it for flushing. Let water run long enough to clear loose debris from the new connections, then reinstall the aerator securely.

Wipe each joint dry with a paper towel or cloth. A dry connection that stays dry during repeated checks is easier to confirm than one covered with standing water.

The Ba Sen Doyle 10-in-1 Heavy-Duty Metal Faucet Aerator Remover Kit covers concealed threaded sizes including M16.5, M18.5, M21.5, M24, and M28, plus M22 round housing.

Choose it when the aerator is recessed or difficult to grip by hand. Its stated uses include kitchen sinks, bathroom sinks, laundry room faucets, and outdoor spigots with aerators.

The tool measures 2.75 x 0.94 x 0.94 in and is made of metal. Check the faucet's aerator style before using it, because the listed sizes do not mean every faucet uses every included fit.

What should you do if the faucet leaks?

Close the shutoff valve and identify the exact leaking joint before tightening anything. A leak can come from a supply connection, mounting area, hose connection, or faucet body.

Dry the area completely, then open the valve briefly while watching the joint. If the leak returns, close the valve and inspect the gasket, washer, thread alignment, and connection type.

Do not keep tightening a connection that still leaks. A damaged seal or mismatched connection may need replacement, and a leak from inside the faucet body may require support from the faucet manufacturer.

When is kitchen faucet replacement complete?

Kitchen faucet replacement is complete when the faucet sits straight, the handles work correctly, water flows from both supply sides, and all connections remain dry after repeated checks.

Keep the cabinet empty until you are confident there is no seepage. Recheck the connections later after normal use, especially if the supply lines moved while the faucet was being installed.

For a basic choice, use the KLEIN TOOLS wrench when multiple common faucet and sink nut sizes matter. Choose the RIDGID tool when its 1 in capacity and under-sink reach fit the job, and choose the Ba Sen Doyle tool when an aerator is the part you need to remove or install.

Measure first, shut off the water fully, and test every connection before storing supplies under the sink.

Frequently asked questions

How long does kitchen faucet replacement take?

Kitchen faucet replacement often takes a few hours, depending on access under the sink, the condition of the old mounting hardware, and how easily the shutoff valves close. Allow extra time for cleaning the sink deck, checking the connections, and testing for leaks before putting the cabinet back in use.

Do I need to shut off the water before replacing a kitchen faucet?

Yes, close both sink shutoff valves before disconnecting the supply lines. Open the faucet to release pressure, then keep a bowl or towel below the connections.

If a shutoff valve will not close fully, stop and arrange for the water supply to be controlled safely before removing the faucet.

Can I replace a kitchen faucet without replacing the supply lines?

You may be able to reuse supply lines if they are compatible with the new faucet, reach the shutoff valves, and have no damage or corrosion. Replace any line that is cracked, kinked, leaking, or too short, and check the faucet instructions for the correct connection type.

How do I know if my replacement faucet fits the sink?

Check the number and spacing of the sink holes, the faucet mounting area, and the clearance below the sink. A single-hole faucet may need a deck plate on a three-hole sink, while unused holes may need covers.

Measure before removing the old faucet.