How to Replace Faucet Cartridge
Learn how to replace a faucet cartridge by shutting off water, removing the handle, matching the cartridge, reinstalling, testing leaks, and troubleshooting.
Quick Answer
To replace a faucet cartridge, shut off the water, cover the drain, remove the handle and retaining parts, pull the old cartridge, match it exactly with the correct replacement, install it in the same orientation, reassemble the faucet, turn water back on slowly, and test for leaks and hot-cold direction.
Tools and Materials
- Replacement cartridge matched to faucet model
- Screwdriver or Allen key
- Adjustable wrench
- Needle-nose pliers
- Towel
- Plumber grease if recommended
- Phone photo for part order
Safety Precautions
- Turn off water supply before disassembly.
- Cover the drain so small parts do not fall in.
- Do not force plastic or brass parts.
- Take photos as you disassemble.
- Call a plumber if shutoff valves fail or corrosion is severe.
Step-by-Step Instructions
- Step 1
Identify the faucet
Find the brand or model if possible so you can buy the correct cartridge.
- Step 2
Shut off water
Turn off hot and cold shutoff valves under the sink, then open the faucet to release pressure.
- Step 3
Cover the drain
Use a towel or stopper to catch screws and clips.
- Step 4
Remove the handle
Find the set screw or decorative cap and remove the handle carefully.
- Step 5
Remove retaining parts
Take off bonnet nut, clip, or retaining ring depending on the faucet.
- Step 6
Pull the cartridge
Pull straight out and note orientation. Use a cartridge puller if the model needs it.
- Step 7
Install the new cartridge
Match orientation and seat it fully without forcing.
- Step 8
Reassemble and test
Turn water on slowly and test hot, cold, flow, and leaks.
Practical Example
Example: A single-handle bathroom faucet drips. You shut off both valves, remove the handle, pull the cartridge, match the part at the hardware store, reinstall it, and the drip stops.
Common Mistakes
- Forgetting to shut off water
- Losing retaining clips
- Buying the wrong cartridge
- Reversing hot and cold orientation
- Forcing stuck parts
- Skipping leak test under the sink
Troubleshooting
The cartridge is stuck
Use the correct puller or call a plumber rather than breaking the faucet body.
Faucet still leaks
Check cartridge orientation, seals, seat condition, and whether the correct part was installed.
Hot and cold are reversed
Turn water off and reinstall the cartridge in the correct orientation.
Shutoff valve leaks
Stop and repair or replace the valve, or call a plumber.
Helpful Internal Links
FAQs
How do I know which faucet cartridge to buy?
Use the faucet brand/model, old cartridge markings, photos, or hardware-store matching help.
Do I need plumber grease?
Use it only if the faucet or cartridge instructions recommend it.
Can I replace a cartridge myself?
Many sink faucets are DIY-friendly, but severe corrosion or failed shutoff valves need professional help.
Why does a cartridge fail?
Wear, mineral buildup, damaged seals, or age can cause drips and poor control.
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