Identify the Delta Valve, Then Match the Parts Diagram

Do not identify an unknown Delta shower valve from the logo or handle shape alone. Your target is the series or exact trim model, followed by the official parts diagram for that model. That diagram—not a visual resemblance in a listing—should supply the replacement part number.

1. Record the complete installed setup

Before disassembly, photograph:

• the whole trim plate and every handle;
• any writing at the bottom or behind the handle;
• the showerhead, tub spout and separate outlet controls;
• the plate’s screw positions;
• the handle removed, showing the stem and sleeve;
• any label, box, receipt or installation sheet left by the installer.

Count the controls and note what each does. A single control that turns water on and changes temperature is not the same architecture as a control with separate volume and temperature handles. A second control that selects a showerhead, hand shower or body sprays may be a diverter or transfer control rather than the mixing valve. If the fault concerns outlet selection, use the transfer-versus-mixing diagnosis before buying a mixing cartridge.

2. Look for a series marking before removing the cartridge

Remove only the handle and trim components needed to inspect behind them. Delta says tub-and-shower model tags are less common, but a series number may appear on the plate behind the handle—examples include 1300/1400, T14, T17 and T17T—and that series is typically enough to identify the cartridge (Delta model-number guidance).

Record the marking exactly. Do not collapse “T17” into “17,” ignore a “T,” or assume every one-handle Delta valve belongs to the same family.

Stop point: If you find a full model number or unambiguous series, search that identifier before taking the valve apart.

3. Use Delta’s model result to reach the documents

Enter a known model number in Delta’s Find Parts and Identify Your Product page. If there is no number, use its Product Identifier Tool; Delta describes it as a sequence of questions that narrows the result to a model page with parts and a parts diagram.

On a plausible model page, compare all of these with the installed shower:

• number and arrangement of controls;
• escutcheon shape and screw locations;
• shower-only versus tub/shower configuration;
• presence of a diverter;
• handle and sleeve arrangement;
• finish only as a final visual check.

Then open the Parts Diagram. Delta says this document usually contains the parts breakdown; when it does not, the Installation Instructions may contain it instead (Delta replacement-parts guidance).

Read the diagram as a model-specific map. For example, Delta’s diagram for models T17076, T17276 and T17476 identifies RP46463 as the valve cartridge and separately labels the adapter assembly, handles, sleeve, escutcheon, trim screws and tub-spout parts (official T17076/T17276/T17476 parts diagram). This is why ordering by “Delta shower cartridge” is too broad.

Stop point: Buy only when the model/series, diagram illustration and diagram part number agree with the installed assembly.

4. Remove the cartridge only if the visible clues are insufficient

Shut off the hot and cold water supplies before disassembling the valve. Delta’s cartridge instructions state this explicitly and recommend plumber installation (Delta cartridge instructions). If the valve has service stops, verify that they actually isolate the valve; otherwise use the appropriate upstream shutoff. Open the control afterward to confirm flow has stopped before loosening the bonnet.

Photograph the cartridge in place, then after removal record:

• every molded or stamped number;
• cap color;
• stem material and profile;
• tabs, keys and notch positions;
• overall length and major diameters;
• the valve-body opening and bonnet.

Do not use color as a universal Delta rule. It is useful only inside a documented comparison. Delta’s instructions distinguish a white-cap RP19804 for the 1300/1400 series from a grey-cap RP46074 for the 13/14 MultiChoice series and state that the two cartridges are not interchangeable. For that specific fork, see the focused RP19804 versus RP46074 guide.

That comparison does not identify every Delta valve. A two-control 17-series assembly, thermostatic trim or separate diverter can lead to different cartridge and adapter numbers. Return to the series and model documents rather than forcing an unknown assembly into the RP19804/RP46074 choice.

5. If no online model matches

Do not convert “closest-looking” into “compatible.” Delta notes that some older models are not available online and asks users to send photos when identification fails. Provide clear front and side views, the exposed valve, cartridge markings, control layout and any series text (Delta model-number guidance).

Keep the old cartridge until the repair is complete. Compare the replacement’s part number, dimensions, tabs and sealing surfaces before installation, and follow the instructions for orientation and temperature-limit adjustment. Shower Parts Store is an identification resource, not a parts seller; the objective is to leave the search with a documented Delta part number, not merely a plausible product photo.