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Quick answer from a licensed plumber: Delta sells its 13/14, 17 and 17T trim kits trim only, for the MultiChoice Universal rough valve (the R10000 on a standard tub or shower), and the cartridge ships in the trim box. So the question is whether your valve is a MultiChoice: Delta says use the age (after 2006) or pull the cartridge and look at the pressure balance housing. On a MultiChoice, any of the three trim series fits, which is how a 14 Series shower becomes a 17 or 17T without opening the wall. Today’s trim kits are not sold for a pre-2006 Monitor 1300/1400 valve; its cartridge is the RP19804.
If you have a MultiChoice valve: the Delta Lahara 14 Series shower trim T14238-SS is a single-handle trim with shower head whose listing names the R10000-UNBX rough (Amazon-sold on September 25, 2026).
Step 1: Is the Rough Valve a MultiChoice?
Delta’s current shower trims are all built for the MultiChoice Universal rough, the R10000 for a standard tub or shower (the R22000 is the integrated-diverter version). Delta describes it as a valve that “gives you the flexibility to upgrade the style and functionality of your shower without altering the plumbing behind the wall,” and its product page lists what matters for trim: “Accepts single, dual, or dual thermostatic cartridge” and “Trim kit sold separately, cartridge ships with trim.” Delta’s Amazon listing for the shower-only version says which trims those are: “compatible with most Delta single-function (13 or 14 series), dual-function (17 series), or dual-function themostatic (17T series) trim kits.”
The catch is the older Monitor valves that look almost the same from the front. Delta’s support note on cartridge caps is the clearest guidance it publishes: “The cap alone can not be used to determine whether the valve is Pre-MultiChoice or MultiChoice. Use the age (>2006 for MC) or pull the cartridge out to examine the pressure balance housing.” The cartridge listings put dates on it: the RP19804 is “Compatible with 1300 / 1400 series tub and shower faucets from 04/2006 and Earlier,” and the RP46074 is for “MultiChoice 13/14 Series tub & showers produced after March 2006.” A valve installed before spring 2006 is almost certainly pre-MultiChoice, and today’s trim kits are not sold for it.
Step 2: Read the Series Off the Old Trim
Delta says tub and shower model tags are rare: “Look for the series number on the plate behind the handle, such as 1300/1400/T14/T17/T17T Series. The Series is typically good enough to identify the cartridge.” The series also tells you what the new trim will do, because on a MultiChoice valve the trim carries the cartridge:
| Trim series | What it is (Delta) | Cartridge that ships in the trim | Handles |
|---|---|---|---|
| 13 / 14 Series (T13xxx, T14xxx) | Monitor pressure balance; “Single function operation” | “Single-function pressure balance cartridge” (RP46074 on MultiChoice) | One lever for on/off and temperature |
| 17 Series (T17xxx) | Monitor pressure balance; “Dual-function pressure balance cartridge” | Dual-function cartridge in the box | “separate handles for volume and temperature control” |
| 17T Series (T17Txxx) | TempAssure thermostatic; “Dual-function thermostatic cartridge” | Thermostatic cartridge in the box | “Control volume and water temperature independently with two separate handles”; temperature stays set |
The 14 and 17 Series trim pages carry the same line, “Trim kit only, must order MultiChoice Universal rough-in separately to complete the unit,” and the 17T page says “must order MultiChoice Universal Valve separately.” So a homeowner with a MultiChoice valve behind the wall can move from a 14 to a 17 or a 17T by changing only the trim, because the new cartridge comes with it. That is the whole point of the valve, and it is why the R10000 page says it “allows you install one rough in the wall and then choose from three different shower functions as well as various styles.” (Kohler also sells Rite-Temp trim separately from its valve; see our Kohler trim guide.)
I send an occasional note when a new guide goes up — repairs worth doing yourself, and the parts that actually last. No spam, no course funnel; written by a licensed Georgia plumber.
Step 3: Which R10000 Body, If You Are Starting Fresh
The rough comes in several suffixes, and Delta’s suffix guide decodes them: “UN — Universal Connection on Inlets/Outlets”, “WS — With Screwdriver Stops”, “BX — Single Box Model”, “BXT — Single Box Model with thin wall mounting kit”, “PX — PEX Crimp Connection”, “MF — PEX Cold Expansion, Memory Fitting”, “IPS –– Iron Pipe Straight Thread”, “LBX –– Lowes packaging of MC Universal Rough”. The R10000-UNBX page lists “Three connection types (IPS, PEX and UNIVERSAL)” and “Valve body without stops”; the Amazon listing for the UNWS version says its “1/2-inch universal inlets accept 1/2-inch copper, 1/2-inch iron pipe, PEX or CPVC adapters.”
| Rough | Stops | Delta’s note |
|---|---|---|
| R10000-UNBX | None (“Valve body without stops”) | Universal inlets and outlets; the trim listings recommend it for tub/shower |
| R10000-UNWS | “Screwdriver stops are conveniently included” | Amazon listing: “ideal for showers with tub spouts” |
| R10000-UNWSHF | With screwdriver stops | Amazon listing: “should be used in showers without tub spouts” (the HF is a shower-only body) |
| R10000-UNBXT / R10000-UNWSBXT | Per suffix | Include the RP47202 thin wall kit, for walls with no stringer to mount to |
The rough valves, all Amazon-sold on September 25, 2026:
- Delta R10000-UNBX MultiChoice Universal tub and shower valve body — no stops.
- Delta R10000-UNWS MultiChoice Universal tub and shower valve body with screwdriver stops.
- Delta R10000-UNWSHF MultiChoice Universal shower valve body with screwdriver stops — the listing says it “should be used in showers without tub spouts.”
- Delta RP47202 thin wall installation aid — Delta: “A thin wall installation mainly means that the installer cannot attach the valve to a stringer/board inside the wall.”
Only the Cartridge Is Bad? Match It by Date
If the trim is fine and the shower only drips or runs cold, the cartridge is the part, and it follows the same 2006 split. The cartridges’ Amazon listings: the Delta RP46074 single-function cartridge is for “MultiChoice 13/14 Series tub & showers produced after March 2006,” and the Delta RP19804 1300/1400 Series cartridge (not linked: third-party seller only on 10/3/2026) fits the “1300 / 1400 series tub and shower faucets from 04/2006 and Earlier.” Both were shipped by Amazon on September 25, 2026. The 17 and 17T cartridges are covered on our Delta cartridge page; the Delta RP47201 MultiChoice cartridge was only offered as an Amazon Resale item that day, so it is not linked. Delta’s T13/14 install video lists the tools: “Phillips head screwdriver”, “Hex key 1/8″, 3mm, or 3/32″”, “Adjustable wrench”, “Plumbers Tape”, and a thermometer and cup for setting the rotational limit stop.
FAQ
Will a new Delta trim kit fit my old Delta shower valve?
Only if the valve is a MultiChoice (R10000), which Delta dates to after 2006. Delta sells its 13/14, 17 and 17T trims as trim only for the MultiChoice Universal rough, with the cartridge in the trim box. Delta says the cartridge cap alone cannot tell you; use the age of the valve or pull the cartridge and look at the pressure balance housing.
Can I change a Delta 14 Series shower to a 17 Series without opening the wall?
Yes, on a MultiChoice valve. The R10000 accepts a single, dual or dual thermostatic cartridge, and the cartridge ships with the trim, so a 17 Series (volume and temperature handles) or a 17T (thermostatic) trim goes on the same rough.
What is the difference between Delta R10000-UNBX and R10000-UNWS?
The suffix: UN is universal inlets and outlets, WS adds screwdriver stops, BX is the single-box packaging. Delta’s listing says the UNWS is ideal for showers with tub spouts, and the UNWSHF is a shower-only body for showers without a tub spout.
Where is the model number on a Delta shower?
Delta says tub and shower model tags are less common; look for the series number on the plate behind the handle, such as 1300/1400/T14/T17/T17T, which is usually enough to identify the cartridge.
Which Delta cartridge fits a 13/14 Series shower?
RP46074 for MultiChoice 13/14 Series showers produced after March 2006; RP19804 for 1300/1400 Series showers from April 2006 and earlier, per their Amazon listings.
Why Trust Plumbing Picks
Plumbing Picks is written by a licensed Georgia journeyman plumber. Every part number, model list, size, setting and fit on this page comes from the manufacturer pages and documents listed below, which we opened and read; product details come from those makers and from the Amazon listings, not from hands-on testing. Each linked product was shipped or sold by Amazon, new and in stock, when we checked on September 25, 2026. Where a link goes to Amazon we may earn a commission at no extra cost to you. Nobody pays to be included here. More on who writes this and how we pick.
Sources
- Delta: R10000-UNBX MultiChoice Universal Tub / Shower Rough
- Delta: T14238 Monitor 14 Series Shower Trim
- Delta: T17238 Monitor 17 Series Shower Trim
- Delta: T17T238 TempAssure 17T Series Shower Trim
- Delta support: Black Capped Tub/Shower Cartridges (pre-MultiChoice vs MultiChoice)
- Delta support: Shower Cartridge Identification Sheet
- Delta support: Where can I find my model number?
- Delta support: Suffixes & Product Codes
- Delta support: How to Install the Delta T13/14 Cartridge & Trim (video)
- Delta support: Thin Wall Mounting Kit Instructions (RP47202)
Bottom Line
Confirm the valve is a MultiChoice (installed after 2006, or check the pressure balance housing), read the series off the old plate, then pick any 13/14, 17 or 17T trim; the cartridge is in the box. Starting fresh, the R10000-UNBX has no stops, the UNWS has stops, and the UNWSHF is shower only.