If your Delta shower leaks or doesn’t mix hot and cold correctly, you might need a new cartridge. You can identify it yourself with clear steps.
Why Identify Your Cartridge
You’ll avoid buying the wrong part. Delta has several types in use through 2025. Knowing the model saves time and avoids unnecessary installs.
Three Common Delta Cartridges
RP19804 – Monitor 1300/1400 Series (1993–2007)
This white-and-blue cartridge has a blue base with short legs. It fits older Monitor valves and has stamped numbers on the stem end :contentReference[oaicite:2]{index=2}.
Measure if needed: ~1.5″ base diameter and 5″ total length.
RP46074 – MultiChoice 13/14 Series (2007–Present)
This off-white Universal cartridge has longer legs and a smooth round bottom. Delta calls it MultiChoice Universal Valve :contentReference[oaicite:3]{index=3}.
RP46463 – Delta 17 Series (Pressure Balance, newer models)
This gray 17‑series cartridge includes two fit‑rings and fits newer pressure‑balance handles. You’ll spot it by its gray color and dual o‑rings at the bottom :contentReference[oaicite:4]{index=4}.
How You Identify Your Cartridge
- Turn off the water and remove the handle, escutcheon, and trim.
- Pull out the cartridge. Don’t force it—there’s a retaining clip or nut.
- Compare its color and shape to the images above.
- Check for part numbers or stamped codes on the stem.
- Use Delta’s online product identifier if you have trim or packaging info :contentReference[oaicite:5]{index=5}.
Expert Advice & Forum Feedback
“I had the RP19804, matched by noting the blue base and size,” says a homeowner on DIY forums :contentReference[oaicite:6]{index=6}.
In Reddit threads and DIY StackExchange, users note that many sellers don’t match random stamped numbers, so visual comparison works best :contentReference[oaicite:7]{index=7}.
Tips for a Smooth Replacement
- Note the handle style and any model codes on trim.
- Take a photo and ask for help at a parts store.
- Replace O‑rings when you change the cartridge.
- Flush the valve body before inserting a new cartridge.
Related Guides
- Install Delta RP19804 Cartridge
- Delta MultiChoice RP46074 Replacement
- Delta Pressure Balance Valve Models
- How to Flush Shower Valve Before Installing Cartridge
FAQ: Delta Shower Cartridge Identification
Can I identify without removing it?
Not reliably. You must pull it. That reveals the color, shape, and often a part stamp.
Do all Delta cartridges have numbers stamped?
Not always. Many older models have random or no numbers. Use visual match instead.
What if I have the trim or model number?
You can use Delta’s part finder online. Enter model or part code to find the correct cartridge :contentReference[oaicite:8]{index=8}.
What if I see a ball, not a cartridge?
That means you have a Delta 600-series ball valved faucet (Delta 212 ball). You need a ball kit instead of a cartridge :contentReference[oaicite:9]{index=9}.
Can I install a new one myself?
Yes. You just remove trim, swap the cartridge, re-install. Handle tools and follow leak‑free instructions.
Bottom Line
Visual match is your best tool. Note the base shape, color, size, and stamped codes. Then compare to RP19804, RP46074, or RP46463 types. Use Delta’s part finder if you have trim info. Replace the right cartridge with proper O‑rings and you’ll fix leaks or temperature mix issues quickly.