What You'll Do to Replace a Moen Kitchen Faucet

Replacing a Moen kitchen faucet involves turning off the water supply under the sink, disconnecting the old faucet's water lines and mounting hardware, lifting it out, and installing the new one in reverse order. The job takes two to four hours for most people and requires only basic tools—an adjustable wrench, a bucket, and possibly a basin wrench if the space under your sink is tight. You do not need to be a plumber; the hardest part is usually reaching the bolts underneath.

Moen faucets come with installation instructions specific to your model, and following those is more important than following general steps, because the mounting system varies. Before you start, locate your water shutoff valves under the sink and test them to make sure they work. If they do not turn or water keeps flowing after you close them, you will need to shut off the main water supply to the house instead.

Key Takeaways

  • Turn off the water at the shutoff valves under the sink, or at the main if those valves do not work, and open the faucet to release pressure.
  • Disconnect the hot and cold water supply lines by loosening the compression nuts with a wrench, and have a bucket ready to catch water.
  • Remove the mounting bolts from underneath the sink using a basin wrench or adjustable wrench, then lift out the old faucet.
  • Install the new Moen faucet by following the model-specific instructions that came in the box, which show where the mounting hardware goes.
  • Reconnect the water lines, turn the shutoff valves back on, and check for leaks around all connections before you consider the job done.

Shutting Off the Water and Draining the Lines

Look under your sink and find the two shutoff valves—one for hot water and one for cold. They are usually oval knobs or small levers on the pipes coming from the wall. Turn both clockwise (or flip the levers to the off position) until they stop. Do not force them; they should turn smoothly.

Once the valves are closed, go back to the sink and turn on the faucet. Let it run for a few seconds until the water stops. This releases the pressure in the lines so you do not get sprayed when you disconnect them. Leave the faucet in the on position while you work.

If the shutoff valves do not turn or water still comes out after you close them, they are stuck or broken. In that case, you will need to shut off the main water supply to the house. This is usually a valve near your water meter or where the main line enters the house. Turn it clockwise until it stops, then go back and open the faucet to drain the lines.

Disconnecting the Water Supply Lines

Place a bucket under the pipes to catch any remaining water. You will see two flexible hoses (or sometimes rigid copper tubes) connected to the shutoff valves with compression nuts—the hexagonal fittings where the hose meets the valve. Use an adjustable wrench to loosen these nuts by turning them counterclockwise. Hold the valve steady with your other hand so you do not twist the pipe itself.

Once the nuts are loose enough, you can usually unscrew them by hand. Pull the hoses away from the valves and let any water drip into the bucket. Some water will come out; this is normal. If your faucet has a sprayer hose, disconnect that too by loosening the nut where it connects under the sink.

Keep the old hoses and nuts if they are in good condition—you may be able to reuse them with the new faucet, depending on the connection type. Moen faucets often come with new hoses, but check your instructions to be sure.

Removing the Old Faucet from the Sink

The faucet is held to the sink from underneath by mounting bolts. Reach up under the sink and locate these bolts—usually two or three of them. They may be covered by a rubber or plastic collar. Use an adjustable wrench or a basin wrench (a specialized tool with a long handle that fits into tight spaces) to loosen and remove these bolts.

A basin wrench is worth renting from a hardware store if you cannot reach the bolts with a regular wrench. It costs a few dollars and saves your hands and knuckles. Once the bolts are out, push up on the faucet from below or pull it down from above—it should come free. If it is stuck, run a utility knife around the base where it meets the sink to cut through any old caulk or sealant.

Lift the faucet out carefully and set it aside. You may see a rubber gasket or mounting ring left on the sink. Remove this and clean the sink surface with a damp cloth to remove old caulk, mineral deposits, or debris. A clean surface helps the new faucet seal properly.

Installing the New Moen Faucet

Open the box and lay out all the parts. Moen includes detailed instructions for your specific model—read these first, because the mounting system varies. Some faucets have a single mounting hole, others have three. The instructions will show you exactly what goes where.

Most Moen kitchen faucets come with a rubber gasket and a mounting collar that go on the sink first. Insert the faucet body through the hole(s) in the sink, then hand-tighten the mounting bolts from underneath. Once they are snug, use a wrench to tighten them fully, but do not over-tighten—you can crack the sink or strip the bolts. Tighten until they are firm, then stop.

If your new faucet comes with a sprayer, connect the hose to the outlet under the faucet body before you tighten everything down. It is much harder to do this after the faucet is fully installed. Follow the instructions for how the hose clips or screws into place.

Reconnecting the Water Lines and Testing

Take the hot and cold water supply lines (either the new ones that came with the faucet or your old ones if they are reusable) and connect them to the shutoff valves. The hot line goes to the hot valve, the cold to the cold valve. Hand-tighten the compression nuts first, then use a wrench to snug them. Again, firm is enough—do not over-tighten.

Connect the other ends of the hoses to the faucet body according to your instructions. Most Moen faucets have clearly labeled ports for hot and cold. Once everything is connected, slowly turn the shutoff valves back on by turning them counterclockwise. Open them all the way.

Go to the sink and turn on the faucet. Let it run for 10 to 15 seconds to flush out any debris from the new lines. Check under the sink for leaks around all the compression nuts and connections. If you see water dripping, tighten that nut a quarter turn with a wrench and check again. Small drips often stop after a few minutes as the gaskets settle. If water is actively spraying or flowing, turn the shutoff valves back off and tighten the connection more.

Adjusting the Faucet and Checking the Spray Function

Once the water is on and there are no leaks, test the handle movement. It should move smoothly from side to side and up and down. If it feels stiff or catches, check that the mounting bolts are not over-tightened—this can bind the handle. Loosen them slightly if needed.

If your faucet has a pull-down or pull-out sprayer, test it by pulling the head toward you or down. The spray should switch on and off smoothly, and the head should retract without resistance. If the sprayer does not retract, check that the hose is not kinked under the sink and that it is routed correctly according to your instructions.

Run hot and cold water separately to make sure both sides work. Check the temperature and flow. If one side is much weaker than the other, the shutoff valve on that side may not be fully open, or there may be debris in the aerator (the screen at the tip of the spout). Unscrew the aerator by hand, rinse it under running water, and screw it back on.

When to Call a Professional

If your shutoff valves do not work and you cannot locate or operate the main water shutoff, call a plumber before you start. Trying to work without being able to turn off the water will flood your cabinet and possibly your home.

If you remove the old faucet and find that the mounting holes do not match the new faucet, or if the sink is damaged, you may need a plumber to drill new holes or assess the sink. If you reconnect everything and water leaks from inside the faucet body itself (not from the connections), the faucet may be defective—contact Moen's customer service or return it.

If you are uncomfortable working under a sink, do not have the right tools, or run into unexpected problems, a plumber can finish the job in an hour or two. The cost is usually $150 to $300 in labor, plus the price of the faucet.

Frequently Asked Questions

Do I need to turn off the main water supply, or can I just use the shutoff valves under the sink?

Use the shutoff valves under the sink first—they are faster and easier. Test them before you start work by turning them and checking if water stops. If they do not work, then shut off the main supply. If you cannot find the main shutoff or it does not work, call a plumber.

What if water keeps dripping from the connections after I tighten them?

Small drips often stop after a few minutes as the rubber gaskets settle. If water is still dripping after 15 minutes, turn off the shutoff valves, loosen the nut a quarter turn, and tighten it again with a wrench. If it still leaks, the gasket may be damaged or the nut may need to be replaced—Moen can send you a replacement kit.

Can I reuse my old water supply hoses with the new faucet?

Yes, if they are in good condition and the connection type matches. Moen faucets typically use standard compression fittings. If the old hoses are kinked, cracked, or more than 10 years old, replace them with new ones—they cost $10 to $20 and are worth the peace of mind.

How tight should the mounting bolts be under the sink?

Tighten them until they are snug and the faucet does not move, then stop. Over-tightening can crack the sink or bind the handle. If the handle feels stiff after installation, loosen the bolts slightly. You should be able to move the handle smoothly without it wiggling.

What if the sprayer hose does not retract properly?

Check that the hose is not kinked or twisted under the sink and that it is routed according to your instructions. Make sure the weight or spring mechanism at the end of the hose is not stuck. If the hose is damaged, Moen sells replacement sprayer hoses for $20 to $40.