Allen wrench set
Use it for: Many faucet handles are held by a small set screw.
Shop Allen wrench setsFaucet repair
How to Replace a Single Handle Faucet Cartridge
To replace a cartridge in a single-handle faucet, shut off the water, remove the handle and retaining hardware, pull the old cartridge straight out, match the replacement by stem and ports, reinstall it in the same orientation, and test hot, cold, and shutoff.
A single-handle faucet cartridge controls both flow and temperature. If the faucet drips, feels rough, will not mix correctly, or loses one side of the water, the cartridge is often the right repair. The job goes smoothly when you keep the parts in order and do not force a stuck cartridge.
Before you start: Match the cartridge stem shape, length, ports, seal locations, and fixture compatibility before ordering.
Safety first
- Shut off the water before removing the handle or cartridge.
- Work slowly around plated trim so tools do not chip or scratch the finish.
- Do not force a stuck cartridge hard enough to twist the faucet body or crack the sink surface.
- Keep small screws, clips, and trim parts out of the drain.
Tools you may need
Screwdriver set
Use it for: Used to remove handle screws, trim pieces, or retaining hardware.
Shop screwdriver sets
Adjustable pliers
Use it for: Helps loosen a retaining nut or pull a stuck cartridge carefully.
Shop adjustable pliers
Cartridge puller
Use it for: Useful if the old cartridge is seized in the faucet body.
Shop faucet cartridge pullers
Clean rag
Use it for: Catches drips and helps clean mineral buildup from the valve body.
Shop microfiber cleaning cloths
White vinegar
Use it for: Helps loosen mineral deposits around the old cartridge and inside the faucet body.
Shop cleaning vinegarAs an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Step-by-step fix
Step 1: Make sure the cartridge is the likely problem
- Check what the faucet is doing before taking it apart. A bad cartridge commonly causes dripping from the spout, weak hot or cold flow on one side, poor temperature control, or a handle that feels stiff or gritty.
- Confirm the problem is at this faucet only. If hot or cold water is weak throughout the house, the issue is probably not the faucet cartridge.
- Look under the sink for active leaks from supply lines or shutoff valves. Those leaks need separate repair.
- If you already bought the replacement, compare it to the old faucet style and make sure it is intended for your faucet before you start.
If it works: The symptoms point to an internal faucet control problem, and cartridge replacement is a reasonable next step.
If it doesn’t: If the faucet body is cracked, the mounting is loose, or the leak is coming from supply connections below the sink, fix those issues first instead of replacing the cartridge.
Stop if:
- Water is leaking from a cracked faucet body.
- The shutoff valves under the sink are badly corroded, actively leaking, or do not appear safe to operate.
Step 2: Shut off the water and open the faucet
- Close the hot and cold shutoff valves under the sink by turning them clockwise.
- Turn the faucet handle on to relieve pressure and confirm the water stops. A small amount of leftover water is normal.
- Put a rag in the sink or over the drain so small screws and clips do not fall in.
- Lay another rag under the work area to catch drips and protect the finish.
If it works: The faucet is depressurized, the water is off, and the work area is protected.
If it doesn’t: If water keeps running after both shutoffs are closed, stop and shut off the water to that fixture or the house before continuing.
Stop if:
- The shutoff valves will not close enough to stop water flow.
- A shutoff valve starts leaking heavily when you operate it.
Step 3: Remove the handle and expose the cartridge
- Look for a small cap, trim plug, or set screw on the handle. Remove the cap if needed and loosen the set screw or handle screw.
- Lift or wiggle the handle off. If it is stuck, work it gently instead of forcing it sideways.
- Remove any decorative sleeve, bonnet, or trim piece covering the cartridge.
- Take out the retaining clip, retaining nut, or collar that locks the cartridge in place. Keep the parts in order as you remove them.
- Take a quick photo before pulling the cartridge so you can match the original orientation during reassembly.
If it works: The old cartridge and its retaining hardware are fully exposed.
If it doesn’t: If trim parts are stuck from mineral buildup, apply a little vinegar, wait a few minutes, and try again with steady pressure.
Stop if:
- The faucet body starts twisting at the sink deck or wall while you try to loosen parts.
- A retaining clip or nut is damaged so badly that it cannot secure the new cartridge safely.
Step 4: Pull out the old cartridge and clean the valve body
- Grip the cartridge stem and pull straight up or straight out, depending on the faucet design. Twist gently only if needed to break it free.
- If the cartridge is stuck, use adjustable pliers carefully or a cartridge puller to avoid damaging the faucet body.
- Once removed, compare the old cartridge to the new one. Match the stem shape, overall length, ports, and seal locations.
- Wipe out the valve body with a rag. Remove loose debris and mineral buildup so the new cartridge can seat fully.
- If the old cartridge left rubber pieces or heavy scale behind, clean that out before installing the replacement.
If it works: The old cartridge is out, the new one matches, and the valve body is clean enough for reassembly.
If it doesn’t: If the new cartridge does not match the old one closely, pause and get the correct replacement before installing anything.
Stop if:
- The inside of the faucet body is cracked, deeply pitted, or damaged where the cartridge seals.
- The old cartridge breaks apart and pieces cannot be removed cleanly from the valve body.
Step 5: Install the new cartridge in the same orientation
- Line up the tabs, flats, or alignment marks on the new cartridge with the matching slots in the faucet body.
- Push the cartridge in fully by hand. It should seat squarely without forcing it.
- Reinstall the retaining clip, nut, or collar and tighten it snugly. Do not overtighten decorative or plastic parts.
- Reinstall the trim and handle in the reverse order you removed them.
- Set the handle in the off position before turning the water back on.
If it works: The new cartridge is seated correctly and the faucet is reassembled.
If it doesn’t: If the cartridge will not seat fully, remove it and check for debris, a misaligned tab, or the wrong replacement part.
Stop if:
- You have to force the cartridge to make it fit.
- The retaining hardware will not engage because the cartridge is sitting too high or crooked.
Step 6: Turn the water back on and test the repair in real use
- Slowly reopen the shutoff valves under the sink.
- Run the faucet through full cold, full hot, and mixed positions. Let it run long enough to clear air from the lines.
- Check that the handle moves smoothly, the temperature changes normally, and the spout stops dripping when turned off.
- Look under the sink and around the faucet body for leaks while the water is running and again after you shut it off.
- Use the faucet a few more times over the next day to make sure the repair holds during normal use.
If it works: The faucet shuts off cleanly, hot and cold control works normally, and there are no leaks at the faucet or shutoffs.
If it doesn’t: If the faucet still drips, the hot and cold are reversed, or the handle range feels wrong, remove the handle and confirm the cartridge orientation and fit. If that checks out, the faucet may need additional internal parts or full replacement.
Stop if:
- Water is leaking from the faucet body after reassembly.
- A shutoff valve or supply connection starts leaking and does not stop with gentle tightening.
Replacement Parts
Find a single handle faucet cartridge on Amazon
Match the cartridge stem shape, length, ports, seal locations, and fixture compatibility before ordering.
As an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Verify the repair
- The faucet turns on and off without sticking or grinding.
- Hot, cold, and mixed water all work as expected.
- The spout does not drip after the handle is shut off.
- There are no leaks around the handle, faucet base, shutoff valves, or supply lines.
FAQ
How do I know the cartridge is bad and not something else?
A bad cartridge usually causes dripping, poor temperature mixing, loss of hot or cold flow at that faucet, or a stiff handle. If the whole house has low pressure or no hot water, the problem is likely elsewhere.
Do I need the exact same cartridge?
Yes. The replacement needs to match the old cartridge's shape, length, ports, and seal locations. Even similar-looking cartridges may not fit or work correctly.
What if the old cartridge is stuck?
Mineral buildup often locks it in place. Try vinegar first, then use steady pressure with pliers or a cartridge puller. Avoid twisting so hard that the faucet body moves or cracks.
Why is the hot and cold reversed after I replaced it?
The cartridge may be installed in the wrong orientation. Remove the handle, pull the cartridge back out, and reinstall it aligned the same way as the original.
Can a new cartridge stop a dripping faucet completely?
Often yes, if the cartridge was the worn part causing the leak. If dripping continues after a correct installation, the faucet body or other internal sealing surfaces may also be worn.
Can I replace a cartridge in a single-handle faucet myself?
Usually yes, if the shutoff valves work, the handle comes apart cleanly, and you can match the exact cartridge. Stop if the cartridge is seized hard enough that the faucet body starts moving.