Replacement for Delta RP19804 Monitor 1300/1400 Series Cartridge
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You can fix this
Likely cause: a worn Delta Monitor cartridge
Delta Monitor valves hold temperature within a few degrees when pressure changes. A big swing means the cartridge is no longer doing that.
Why this happens
Delta says its Monitor valves hold the water within about plus or minus 3.6F when pressure changes, such as when a toilet flushes. A large swing is well outside that, which points at the balancing cartridge. Delta's 1300 and 1400 series Monitor valves take the RP19804 cartridge, and the 13 and 14 series take the RP46074, which Delta says succeeds the older RP19804.
How to fix it
- Shut off the water to the shower, at its stops or at the main.
- Remove the handle and trim, and read the series from the valve or your paperwork. The split between the two cartridges comes from a customer answer on Delta's parts page, so confirm by valve model.
- Remove the bonnet nut and pull the old cartridge. Note how it faced.
- Install the new cartridge the same way, reassemble, and turn the water back on.
- Test with a thermometer at full hot. Keep the hottest water at 120F or less, as CPSC advises, and adjust the limit stop by following your valve's guide if needed.
When to stop. If the cartridge is stuck or the valve body is damaged, stop. Delta recommends a licensed plumber if you do not have plumbing experience.
The part that fixes it
1300 and 1400 series Monitor valves take RP19804. 13 and 14 series valves take RP46074.
Replacement for Delta RP46074 MultiChoice 13/14 Series Cartridge
FourHome is our own brand of replacement parts; this site is published by the team behind it. We earn from purchases made through this link.
Not sure which part you have? Pull the old one and match it by brand, length and broach on Stems & Cartridges, an identification index of faucet stems and cartridges by part number.
If this does not fix it, tell the plumber
- It is a Delta single-handle shower, and the temperature jumps when a toilet flushes.
- The valve series if you could find it (1300/1400 or 13/14).
- Whether you already replaced the cartridge.
Build the full list: what to tell the plumber.
Start this troubleshooter over
References (every fact above comes from one of these pages)
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