Identify the faucet cartridge before you replace it.
Confirm the cartridge through the faucet model and manufacturer parts information. Brand, handle style or a similar-looking cartridge can narrow the search but do not confirm fit. Already have a manufacturer-confirmed part number? Go to the replacement check.
On this page (10)
Start with the faucet, then confirm the service part.
- Faucet identity
Manufacturer and model, when known
Use the installed faucet’s markings, paperwork or model information to find its manufacturer parts diagram. Keep the fixture type and handle arrangement with that record.
- Supporting clues
Markings and geometry
If the cartridge is already safely exposed or removed, record its markings, stem, ports, tabs and useful dimensions. These clues narrow candidates; a seller SKU or one matching measurement does not prove fit.
- Confirmed match
The faucet-to-service-part relationship
Confirm the replacement in manufacturer parts information or a reliable parts cross-reference that applies to the exact faucet. Resolve conflicting clues before ordering. Availability is a separate check.
Begin with information already available. If the model is unknown, keep the visible markings and fixture context together; do not remove a cartridge just to gather identification details.
Record the faucet details while the fixture is still intact.
Photograph the whole faucet, its handles, any manufacturer name or logo, and any model or series information. If a part has already been safely removed, keep it with the details of the faucet it came from and note its original orientation.
A number helps only when you know what the number refers to.
A faucet model number, cartridge marking, manufacturer part number, seller SKU, and a seller’s “replacement for” claim are not the same thing. Mixing them up can lead you to order the wrong part.
When you need to confirm a replacement, prefer manufacturer service documentation or a reliable parts cross-reference over seller wording.
- Fixture model / series
Identifies the installed faucet family when the marking is reliable and tied to the actual fixture.
- Cartridge marking
Can be highly useful, but must be interpreted in the context of the actual cartridge and manufacturer.
- Seller SKU or title
A seller SKU or product title does not confirm that the part fits your faucet.
Shape and measurements can narrow the options, but they do not confirm fit on their own.
Useful clues include stem profile, body shape, tabs or indexing features, ports or openings, distinctive end shape, and dimensions that help tell similar cartridges apart.
One matching measurement is not enough to confirm compatibility. Cartridges can share the same length, color, or stem style while differing in ports, indexing, retention, function, or other details that affect fit.
Do not order a cartridge from approximate shape or one measurement alone.
Use the manufacturer’s documented relationship, not a similar-looking listing.
A useful parts record connects the installed faucet model to a specific cartridge or service kit. Check any stated model, generation or retention limits; a part being available for sale does not establish that relationship.
A documented example: Moen’s kitchen-cartridge guide lists cartridges 4000 and 40002 as interchangeable. That published relationship does not mean either fits every Moen faucet. For its Duralast service kits, the guide also distinguishes retainer nuts that are not interchangeable.
Source: Moen, Faucet Cartridges: Kitchen, checked October 7, 2026. The example applies to the named cartridges in that guide; it is not an all-brand compatibility table.
If the faucet and cartridge clues disagree, stop before ordering.
If the clues disagree, do not order the closest-looking cartridge. Re-check the faucet model and part details first.
| Faucet details | Cartridge / seller listing | Next step |
|---|---|---|
| Faucet detailsBranding suggests one faucet family | Cartridge / seller listing Cartridge markings point to another family or cannot be reconciled with the fixture. |
Next step Re-check the faucet model and what the cartridge marking refers to before selecting a part. |
| Faucet detailsMeasurements point to one possible match | Cartridge / seller listing Official service documentation identifies a different cartridge. |
Next step Manufacturer parts information takes priority over a cartridge that only looks similar. |
| Faucet detailsInstalled faucet is documented | Cartridge / seller listing A seller title says “replacement for,” but manufacturer information does not confirm the match. |
Next step Do not rely on the seller claim until another reliable parts source confirms it. |
| Faucet detailsA previously bought part looks right | Cartridge / seller listing The visually similar cartridge does not operate correctly in the faucet. |
Next step Re-check the cartridge match instead of trying another approximate fit. |
resolve the mismatch before you order a part.
Already have a confirmed part number? You do not need to identify it again.
Use that exact manufacturer part or service-kit number when checking a seller’s listing, included pieces, availability and price. If your question is whether that part fits this faucet, confirm the faucet-to-part relationship first; a known number alone does not answer compatibility.
For replacement, follow the manufacturer’s instructions for that faucet and part. Make sure you can shut off the water, preserve the original orientation before removal, and check that the original problem is gone afterward. If a practical shutoff is unavailable, stop and get appropriate plumbing help.
Replacement details vary with the faucet and retention design.
You can prepare in general, but retainer type, extraction force, torque, lubricant, seals, orientation, and special tools can vary by model. Follow the manufacturer’s instructions for the faucet and cartridge you identified.
Do not use generic replacement steps on an unidentified faucet. If you are unsure how the cartridge is retained or which part belongs there, identify the faucet and cartridge before continuing.
Sometimes the right fix is the faucet, not the cartridge.
If you still cannot identify the cartridge, or a repair did not fix the leak, recheck the part identification and faucet condition. When the faucet itself needs replacing, use the whole-faucet replacement guide.
If the faucet itself may need replacement, use the whole-faucet guide instead of continuing to guess at the cartridge. Check faucet replacement →
Some cartridge problems need broader plumbing help.
A practical shutoff is unavailable.
The work involves hidden or inaccessible plumbing.
The faucet body or surrounding connection appears damaged.
A replacement attempt reveals a larger connection or plumbing problem.
A repair has already failed and you still cannot confirm the cartridge.
What numbers should you photograph?
Record stamped, printed or molded characters exactly. Include enough of the surrounding part to show where each number appears, and keep reliable manufacturer or faucet-model information with the photo. A close-up without that context can make a component marking look like an orderable part number.
What to do next.
Faucet cartridge identification guide
Compare the faucet model, cartridge markings and shape, and manufacturer parts information. Visual similarity or seller wording alone does not confirm fit.