Part family guide
Delta Monitor 1300/1400 Cartridge Generations
Delta divides this visually similar cartridge family by rough-in generation: RP19804 serves older Monitor 1300/1400 valves, while RP46074 serves later 13/14 Series MultiChoice valves.
Direct answer
Do not choose between RP19804 and RP46074 by color alone. Delta ties RP19804 to 1300/1400 valves installed before the MultiChoice transition and RP46074 to 13/14 MultiChoice valves; identify the rough-in generation and compare the cartridge lower housing before ordering.
Fit facts
What identifies this match
Use these details together. One matching feature does not establish compatibility.
- Older member
- RP19804
- Later member
- RP46074
- Older application
- Monitor 1300/1400 Series
- Later application
- Monitor 13/14 Series MultiChoice Universal
- Key boundary
- Valve generation and installation era
- Relationship
- Parallel applications, not a blanket supersession
Two generations with similar job descriptions
Both parts regulate a single-control Delta pressure-balance shower valve, which is why they are frequently grouped. Delta nevertheless publishes separate application language for the older 1300/1400 and newer 13/14 MultiChoice platforms.
Date and platform boundary
RP19804 is associated with Monitor 1300/1400 valves from before the MultiChoice Universal rough-in generation. RP46074 is the replacement assembly for 13/14 Series MultiChoice valves.
Installation date is evidence, not absolute proof: renovations can leave an older valve behind newer trim. Valve and cartridge details must agree.
Why this is not a supersession
RP46074 did not universally replace RP19804 in every wall. Each remains tied to its rough-in geometry. A newer part number therefore does not mean backward compatibility.
Compare the lower legs, seals, overall body, and the valve socket with official Delta images after removal.
Avoid neighboring Delta cartridges
Monitor 17 dual-function, 17T thermostatic, and newer integrated-diverter systems use other assemblies. Series numerals describe control architecture, so a similar white-and-blue body is not sufficient identification.
Questions
Before you remove or replace the part
Does RP46074 replace RP19804?
Not across all valves. Delta assigns them to different rough-in generations.
Is the faucet installation date enough?
No. Trim may have been updated while the in-wall valve remained; inspect the platform and old cartridge.
What does MultiChoice indicate?
It identifies Delta’s later universal rough-in platform, the application associated with RP46074 for 13/14 Series trim.
Reference trail