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Delta RP19804 vs Delta RP46074

Both fit Delta one-handle, temperature-only showers (13/14 series). Delta says they are not interchangeable.

The quick test: Look at the old cartridge: white body with blue legs means RP19804; gray means RP46074. No cartridge to look at? Valves installed before March 2006 use the RP19804.

Delta single-function shower cartridges: white body with blue legs (RP19804) versus gray (RP46074) RP19804 white + blue legs, before 3/2006 RP46074 gray, after 3/2006
Delta Monitor 13/14 series showers. The two are not interchangeable: match the color of your old cartridge, or go by when the valve was installed. Simplified drawing, not to scale.
Delta RP19804Delta RP46074
FitsMonitor 1300/1400 series, single-function pressure balanceMultiChoice Universal 13/14 series, single-function pressure balance
How it worksOne handle sets temperature at full flow; no separate volume control. Built-in rotational limit stop (pull and turn to adjust).One handle sets temperature at full flow; no separate volume control. Built-in rotational limit stop (pull and turn).
Volume controlNoNo
Held in byBonnet nut (under the sleeve)
Height4-1/8 in.4-7/16 in.
Yearsuntil about 2006from 2006
How to recognizeWhite body with blue legs (Delta Q&A)Gray cartridge (Delta Q&A); 'Hot Side' marking on the gray plastic (secondary)

Still not sure? Use the cartridge identifier, and compare your old part before buying.