From the valve to the order
Can new trim fit a valve that is already in the wall?
New trim fits a concealed valve only when the maker lists that trim for that valve. Delta’s MultiChoice page says any 13, 14, 17 or 17T series trim kit that Delta currently makes will work with its MultiChoice Universal rough-in valve.
Delta presents this as changing style and function without altering the plumbing behind the wall.
Moen’s valve comparison points the other way. For M-Core 2 Series, M-Core 3 Series, PosiTemp and Moentrol, Moen’s answer on whether the trim is compatible with other Moen valves is no.
When a supplier calls a trim universal, ask what it is universal within: a valve family, a generation or a list of part numbers.
| Term | How a named maker uses it |
|---|---|
| Rough-in valve | Delta sells the MultiChoice body alone, without trim. |
| Trim kit | Delta’s trim-only kits begin with the letter T. |
| Base set, finish set | hansgrohe’s names for the concealed part and the visible part. |
| Plasterguard | Delta’s guard on the valve body; its front is the reference for the finished wall. |
How do you identify the valve behind the trim?
Start from records, then use the clues the maker publishes, as in Moen’s M-Core identification article. Six steps:
- Collect the invoice, manual or installer’s record.
- Note the brand and any model code.
- Note how the handle moves. Moen lists rotate only, lift and rotate, or push/pull and rotate across its four systems.
- Look for the maker’s visual clues. Moen puts M-Core 2 Series temperature indicators at 3 o’clock and 3 Series indicators at 9 and 3 o’clock.
- Use the cartridge if it is known. Moen gives 1212 (gray) for M-Core 2 Series and 1213 (blue) for 3 Series.
- Record what is still unknown and ask the maker or a qualified installer.
Leave opening a wall or disturbing a pressurized valve to a qualified installer.
What do makers publish about trim and valve families?
Each maker defines its own family, and the statements differ in reach. Four examples:
| Maker | System | What the maker says |
|---|---|---|
| Delta | MultiChoice Universal rough-in | Any 13, 14, 17 or 17T series trim kit Delta currently makes. |
| Moen | M-Core 2 Series, M-Core 3 Series, PosiTemp, Moentrol | Moen answers no to whether each system’s trim is compatible with other Moen valves. |
| hansgrohe | iBox universal 2 | All hansgrohe and AXOR finish sets; older ranges need an adapter plate. |
| Symmons | Temptrol valve | Symmons wrote in 2021 that it is compatible with all 14 Temptrol trim collections. |
Within M-Core, Moen’s 2 Series to 3 Series article says a 2 Series can be changed to a 3 Series by fitting a 3 Series trim kit, which includes the 1213 flow cartridge, without changing the valve body.
Does the cartridge come with the valve or with the trim?
It depends on the system. Moen’s comparison says the cartridge comes with the trim for M-Core and with the valve for PosiTemp and Moentrol.
| System | What the maker says |
|---|---|
| Delta R10000-LBX valve body | Valve body only; cartridge ships with trim. |
| Delta T11900 diverter trim | Includes valve cartridge. |
| Moen M-Core 2 and 3 Series | Cartridge comes with the trim. Flow cartridge included with the trim kit. |
| Moen PosiTemp and Moentrol | Cartridge comes with the valve. |
Moen gives each of the four systems its own cartridge service kit: 1212, 1213, 1222 and 1225. Ask whether the offered kit includes the cartridge, and which one.
Is it a cosmetic swap or a change of function?
A listed trim of the same type is a smaller change than a new control function. Three points to separate:
Control type
Delta lists three MultiChoice cartridges: single-function pressure balanced for 13 and 14 Series, dual-function pressure balanced for 17 Series and dual-function thermostatic for 17T. Moving from 14 Series to 17 or 17T means a different cartridge type.
Diverter
Delta’s T11900 diverter trim has three individual and three shared positions and needs its own rough-in, R11000, sold separately. A temperature trim that matches does not tell you which diverter is installed.
Outlet flow
PMI says a lower-flow outlet can significantly compromise an automatic compensating valve’s ability to compensate for inlet pressure changes. PMI adds that ASSE 1016-2011/ASME A112.1016/CSA B125.16-11 requires the maker to state the minimum showerhead flow rate for the valve. CSA Group’s store page shows the 2017 edition, reaffirmed in 2026, and flags that an update is available.
- Trim kit code and series
- Cartridge, if it is not in the kit
- Diverter trim and its own rough-in
- Showerhead flow against the valve’s stated minimum
Can older valves take new trim through an adapter?
Sometimes, and only by the route the maker publishes. Three examples:
hansgrohe iBox universal
hansgrohe says the iBox universal 1 remains compatible with finish sets launched before 2023. Older finish sets go on the iBox universal 2 with an adapter plate, sold separately. hansgrohe does not state on that page that newer finish sets fit the iBox universal 1; ask before ordering.
Moen Standard valve
Moen’s 145058 adapter kit lets a Standard valve accept new Moentrol trim. Moen excludes six named collections and requires a 7-inch round escutcheon plate on the new trim.
Delta Monitor 1300 and 1400
On Delta’s T13420-PD page, Delta staff answer that this trim can be used with an existing 1300/1400 Series valve and cartridge (RP19804). That is a customer-service answer, not a specification; ask for it in writing.
If the maker publishes no route for a pairing, treat the pairing as not approved.
Can wall depth stop a listed trim from fitting?
Yes. Delta sets the valve depth by the finished wall, and Kohler’s deep rough-in kit guide lists depth kits by trim. What the two makers say:
| Source | What it says |
|---|---|
| Delta rough-in instructions, Rev. L | Finished wall flush with the front of the plasterguard, ± 1/4 in (models with stops: flush or up to 1/4 in subflush); with a thin wall the plasterguard sits behind the wall. |
| Kohler deep rough-in kits | Listed by trim for five valve models; K-8304 uses universal kit 10350-NA. |
| Kohler, Revival and Memoirs note | Trims manufactured before 3/20/2009 use deep roughing-in kit 73418. “The deep roughing kits are non-interchangeable.” |
How should a buyer check trim compatibility before ordering?
These steps are procurement guidance, not an installation method.
- Identify the valve. Brand, family, generation and any manufacturing date.
- Ask for the maker’s list. The page or written statement that pairs the new trim with that valve.
- Settle the function. Same control type, or a change of cartridge or outlets.
- List every part. Trim, cartridge, adapter and diverter trim with its own rough-in.
- Check the wall. The installer compares valve depth and any new finish with the instructions.
- Check outlet flow. Showerhead flow against the valve maker’s stated minimum.
- Keep the answer. File the document behind the match with the order.
When the valve cannot be identified
Record it as unknown and ask for a professionally scoped valve replacement. This guide does not approve cross-brand adapters or promise that a wall can stay closed.
What should you send and ask before a quotation?
A useful request names the installed valve, not only the trim wanted.
| Question | Why it matters |
|---|---|
| Which valves is this trim listed for? | A universal claim holds within a named family. |
| Which document shows the match? | A traceable answer names its source. |
| Is the cartridge in the kit? | Supplied with the trim or in the valve. |
| Is an adapter or depth kit needed? | Makers list these by valve and trim, sometimes by date. |
| Does the diverter need its own rough-in? | Delta’s diverter trim does. |
| What is the valve’s minimum outlet flow? | PMI says a lower-flow outlet can affect compensation. |
Include with your request
- Valve brand, family and generation, or marked unknown
- Photos of trim, markings and records
- Function wanted and number of outlets
- Wall build-up and any new finish
- Quantity per room type
WNS Global confirms any product and terms it offers separately in writing. This guide does not state that WNS Global products have the features, ratings or listings named above.
