What You Need to Know Before Starting

A Moen cartridge is the part inside your faucet that controls water temperature and flow. When your double-handle Moen faucet drips, sprays unevenly, or the handles stick, the cartridge usually needs replacing. The job takes 30 to 45 minutes and costs $15 to $40 for the cartridge itself — far less than calling a plumber.

You do not need special plumbing skills. You will need a screwdriver, an adjustable wrench, and a cartridge puller (a tool Moen sells for about $10, or you can rent one from a hardware store). The hardest part is turning off the water and keeping track of small parts. If you have never done this before, set aside time and lay out your tools before you start.

Key Takeaways

  • Turn off the water at the shutoff valves under the sink before you remove anything from the faucet.
  • You will need the correct cartridge for your faucet model — check the number stamped on the old cartridge or call Moen with your faucet's model number.
  • A cartridge puller is essential; trying to yank the cartridge out by hand will damage the faucet body.
  • Mark which cartridge goes in which handle (hot and cold) before you remove them, because they are not interchangeable.
  • The entire job — shutoff, removal, installation, and testing — should take under an hour if you have the right cartridge and tools.

Turn Off the Water Supply

Look under your sink. You should see two shutoff valves — one for hot water and one for cold. Turn both clockwise until they stop. Do not force them; they should turn smoothly. If they do not turn or you cannot find them, you will need to shut off the main water valve for your house (usually in the basement or outside).

After you close the shutoff valves, turn on the faucet at the sink and let the water run until it stops. This drains the lines so you do not have water spraying when you open the faucet body.

Remove the Handle and Trim Ring

On a double-handle Moen faucet, each handle sits on top of its own cartridge. Start with one handle — it does not matter which. Look for a small screw under the handle or hidden behind a decorative cap. On many Moen models, you will see a cap marked "H" (hot) or "C" (cold). Pry this cap off gently with a flathead screwdriver.

Unscrew the handle screw and lift the handle straight up and off. Set it aside in a safe place. Next, you will see a trim ring — a collar that sits flush against the sink. Use an adjustable wrench to turn this ring counterclockwise. It will come off in your hand. Keep this ring; you will reinstall it later.

Locate and Remove the Cartridge

Under the trim ring, you will see the cartridge — a cylindrical piece about 2 inches long. Before you remove it, look at the top. Most Moen cartridges have a small notch or flat edge that shows which way it is oriented. Take a photo or make a note of this, because you will need to reinstall the new cartridge in the same position.

A cartridge puller is a two-pronged tool that grips the cartridge stem. Insert the puller over the cartridge stem and tighten the center screw. As you tighten, the puller will grip the cartridge. Once it is tight, turn the entire puller counterclockwise. The cartridge will slide out. If you do not have a puller, do not try to pull the cartridge out by hand — you will crack the faucet body.

Once the cartridge is out, inspect it. If it is cracked, discolored, or has mineral buildup, that is why your faucet is leaking or sticking. Set it aside and note which handle it came from (hot or cold).

Install the New Cartridge

Before you install the new cartridge, check that it matches the old one. Moen cartridges come in different types — the model number is stamped on the side. If you are not sure you have the right one, take the old cartridge to the hardware store and match it by number. Installing the wrong cartridge will not damage anything, but the faucet will not work correctly.

Align the new cartridge so the notch or flat edge matches the position of the old one. This is critical — if the cartridge is rotated even slightly, the hot and cold handles will be reversed. Insert the cartridge straight into the opening and push it in by hand until it stops. You should feel it seat fully. Do not force it; if it does not slide in smoothly, remove it and check the orientation again.

Once the cartridge is seated, reinstall the trim ring by turning it clockwise by hand until it is snug. Do not overtighten — you will crack the ring. Reinstall the handle screw, then the handle itself, and snap the decorative cap back on.

Repeat for the Second Handle

Now repeat the entire process for the second handle. Remove the cap, unscrew the handle, remove the trim ring, pull the cartridge, and install the new one. Make sure you use the correct cartridge for each handle — they are not interchangeable, and installing them backward will reverse your hot and cold water.

If both cartridges are the same model number, you can use either one in either position. If they are different models, mark them clearly before you start so you do not mix them up.

Turn the Water Back On and Test

Once both cartridges are installed and both handles are back in place, turn the shutoff valves back on. Turn them counterclockwise slowly — do not crank them open all at once. Listen for water flowing back into the lines. You may hear air hissing out of the faucet; this is normal and will stop after a few seconds.

Turn on the faucet and check for leaks at the base where the faucet meets the sink. Check under the sink around the shutoff valves and the supply lines. If you see water dripping, turn the shutoff valves back off and check that the trim rings are tight. If water is still leaking after you tighten the rings, you may have installed a cartridge backward — turn off the water, remove the handle, and check the cartridge orientation.

Test both the hot and cold handles. The water temperature should change smoothly as you move the handle from cold to hot. If the handles feel stiff or the temperature does not change, the cartridge may not be seated fully. Turn off the water, remove the handle, and push the cartridge in again.

Frequently Asked Questions

How do I know which cartridge to order?

The model number is stamped on the side of the old cartridge. Write this number down and take it to the hardware store, or call Moen customer service with your faucet's model number (usually found on the faucet body or in your paperwork). Moen will tell you which cartridge you need.

What if the cartridge will not come out?

Do not force it. Mineral buildup inside the faucet can make the cartridge stick. Soak the area with white vinegar for 15 to 20 minutes to dissolve the buildup, then try the puller again. If it still will not budge, you may need to call a plumber — forcing it will damage the faucet body.

Can I use a cartridge from a different brand?

No. Moen cartridges are designed specifically for Moen faucets and will not fit other brands. Using the wrong cartridge will not work and may damage your faucet. Always use a Moen cartridge in a Moen faucet.

Why is my faucet still leaking after I replaced the cartridge?

Check that the trim ring is tight — a loose ring is the most common cause of leaks. If the ring is tight and water is still dripping, the cartridge may be installed backward or not seated fully. Turn off the water, remove the handle, and reinstall the cartridge, making sure the notch aligns with the original position.

Do I need to turn off the main water valve?

Only if the shutoff valves under the sink do not work. If they turn smoothly and you can feel water stop at the faucet, you do not need to shut off the main valve. If the shutoff valves are stuck or missing, turn off the main valve before you start.