EDIT: Solved! Using very thorough (but gentle) removal of all deposits, and additional grease on the o-rings. The old cartridge is pictured. After I removed it, I looked and felt inside the brass valve body. I gently scraped away some deposits with a flathead screwdriver, then used a normal toothbrush all around the inside to make sure it was smooth enough for the new cartridge to slide in. I purchased an expensive genuine cartridge from Lowes. It was a straightforward swap so when it dripped again (possibly more rapidly) after restoring the water supply, I really couldn't think of what to try next. Answer from andrewl_ on reddit.com
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Delta shower faucet still drips after cartridge replacement. Ideas?
EDIT: Solved! Using very thorough (but gentle) removal of all deposits, and additional grease on the o-rings. The old cartridge is pictured. After I removed it, I looked and felt inside the brass valve body. I gently scraped away some deposits with a flathead screwdriver, then used a normal toothbrush all around the inside to make sure it was smooth enough for the new cartridge to slide in. I purchased an expensive genuine cartridge from Lowes. It was a straightforward swap so when it dripped again (possibly more rapidly) after restoring the water supply, I really couldn't think of what to try next. More on reddit.com
🌐 r/DIY
5
2
January 30, 2024
Replace Delta Monitor 1400 Shower Faucet
The trim will work, but the cartridge will not. You'll need to replace the cartridge with the proper model, RP19804. The cartridge in the trim kit, RP46074 is not compatible with your body. More on reddit.com
🌐 r/Plumbing
3
1
May 28, 2023
plumbing - How to remove/replace the cartridge for this Delta Monitor shower faucet? - Home Improvement Stack Exchange
Well I discovered that the model i had was a Delta 1500 series Monitor faucet. Through internet searches I found a Delta conversion kit. It upgrades your 1500 series to the newer 1700 series. Part # RP29405. It comes with a cartridge, new springs and gaskets, bonnet nut, sleeve, shower head ... More on diy.stackexchange.com
🌐 diy.stackexchange.com
May 18, 2018
Replacing Delta 18 jetted shower faucet
As you can see my shower faucet has been destroyed by hard water. I’m looking to replace this Delta 18 series jetted shower faucet; however, I’ve learned that the faucet has been discontinued. I would prefer to replace with the exact item so that I don’t have to replace any valves. I’d also like to keep the diverter with jets if possible. I’ve found a few on eBay but they’re selling for a lot more $ than it’s worth. What are some options I can do as a DIYer without having to call a plumber to replace valves? https://www.deltafaucet.com/bathroom/product/T18255-RBXO.html Thank you More on reddit.com
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9
2
August 26, 2020
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The Home Depot
homedepot.com › p › Delta-Rebuild-Kit-for-Monitor-Single-Lever-Handle-Tub-Shower-Applications-RP77744 › 205166208
Delta Rebuild Kit for Monitor Single Lever Handle Tub/Shower Applications RP77744 - The Home Depot
Delta Rebuild Kit for Monitor Single Lever Handle Tub/Shower Applications RP77744
This Rebuild Kit for Delta Monitor Single Lever Handle Tub/Shower Applications is an easy repair for the weekend DIYer. Delta aims to provide the best experience with water and knows that, sometimes, repairs are in order. That's why this part is available to consumers to order. Just another way Delta is more than a faucet.
(3.8)
Price   $76.97
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Instructables
instructables.com › workshop › repair
How to Change the Cartridge of a Delta Monitor Shower Valve. : 8 Steps - Instructables
October 29, 2017 - Tighten by hand only, even if it was necessary to loosen the bonnet with pliers, still tighten by hand (see picture 1). 2. Slowly open the main shut off valve about half way (see picture 2). Leave the faucet used to relieve the pressure open while the system is filling. Once all the air is purged and a steady stream is running out of the spout, shut all faucets off and let the system fill completely. Turn the main water shut off all the way on. 3. Inspect the shower valve and make sure there are no leaks (see picture 3).
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Quora
quora.com › Can-a-Delta-Monitor-shower-faucet-valve-be-rebuilt
Can a Delta Monitor shower faucet valve be rebuilt? - Quora
Answer (1 of 6): Tell them you need a 1700 series delta cartridge. If the shower head or spout is dripping when the water is off then you only need seats and springs that sit behind the cartridge in the valve body. I use a 90° pic to remove them. Seats and springs are a much cheaper option. You ...
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Quora
quora.com › How-do-I-fix-a-delta-shower-faucet
How to fix a delta shower faucet - Quora
First, you use a pair of slip joint pliers (Channel locks) and with light torque try to remove the large chrome assembly that holds the faucet ball and seat/spring in place. Old style cap assembly has raised marks in the body of the cap.
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JustAnswer
justanswer.com › plumbing › n31ov-delta-monitor-tub-shower-faucet-water.html
Delta Monitor Faucet Dripping? Expert Troubleshooting Guide
A dripping Delta Monitor tub/shower faucet usually indicates a faulty cartridge. Turn off water supply, remove the handle and escutcheon to access the cartridge. Inspect for worn O-rings or mineral deposits causing leaks.
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Danco
danco.com › home › shop › repair parts › faucet repair parts › cartridges › replacement cartridge for delta monitor single-lever faucets
Replacement Cartridge for Delta Monitor Single-Lever Faucets - Danco
June 6, 2025 - Repair your leaky faucet with the Danco Replacement Cartridge for Delta Monitor Faucets. Fixing your dripping tub/shower faucet by replacing the cartridge will save water and keep you from buying an entire new faucet.
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Well I discovered that the model i had was a Delta 1500 series Monitor faucet. Through internet searches I found a Delta conversion kit. It upgrades your 1500 series to the newer 1700 series. Part # RP29405. It comes with a cartridge, new springs and gaskets, bonnet nut, sleeve, shower head w/chrome neck, and complete 1700 series handle assembly. Everything is chrome. It turns out that the 1500 series uses the universal valve so the 1700 series cartridge fits in it.

A couple of tips to using the conversion kit. First it comes with 2 sets of gaskets that sit in the back of the valve housing. Use the thicker ones. I used the skinnier ones because they were the same size as the old ones I removed, but it still leaked after I screwed the bonnet nut on. I finally tried the thicker gasket (the thicker ones are connected to each other) and it sealed it right up. I believe the 1700 series cartridge is slightly shorter than the old 1500 cartridge and thus why the thicker gasket was needed. Second tip is the new shower head might not fit on your old neck. Mine didn't and I wasn't in the mood to change that out just yet, so I have chrome handle and back plate with the brass/gold shower head and tub spout. I have both pieces, but I'll save that for another day. Right now the shower is back to working with full pressure hot and cold. Now I just need to replace the water heater elements and I'm back.

If you have a 1500 series faucet and want to upgrade to the 1700 series. All you really need is a 1700 series cartridge and a 1700 series handle assembly. If you can find the handle assembly separate locally or on CL or something you can make the conversion much cheaper possibly. I ordered the conversion kit from Amazon + the chrome tub spout with pull down shower activator for $128 shipped, 2 day Amazon prime. Not too bad. Hope this helps someone down the road.

Sorry for the lack of pictures. I was fighting this thing in low light and no help. The instructions that came with the kit didn't help much.

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but that doesn't relate to the handle assembly.

What makes you think that ?

As you stated, On the front of the handle is plastic cover with the red and blue indicators, you should be able to pry it off with a thin screw driver or something similar.

That should give you access to the screw that holds the handle on.

If that is the case then place a cloth over the drain opening ( so you do not drop the screw down the drain ) and remove the cover and then the screw holding the handle on, the handle should put straight off. It may be a little tight so wiggling it back and forth while pulling may be required.

Unlikely but: It may be that handle is held on by the outer knurled cap, remove the screw and you pull or unscrew the outer knurled cap, then you can pull the body of the handle off.

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YouTube
youtube.com › watch
Delta Shower Faucet Seal Kit FREE (1700 Monitor Series) - Leak Repair for FREE - YouTube
2002 Delta Monitor 1700 series shower faucet was dripping water. Here's how I fixed it for FREE using RP28603 seal kit sent to me directly from Delta. Delta ...
Published   November 14, 2022
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Reddit
reddit.com › r/askaplumber › replacing delta 18 jetted shower faucet
r/askaplumber on Reddit: Replacing Delta 18 jetted shower faucet
August 26, 2020 - As you can see my shower faucet has been destroyed by hard water. I’m looking to replace this Delta 18 series jetted shower faucet; however, I’ve learned that the faucet has been discontinued. I would prefer to replace with the exact item so that I don’t have to replace any valves.
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YouTube
youtube.com › watch
Delta monitor 1700 repair. DIY Dad at it again. - YouTube
Does your shower faucet drip? Here is the DIY fix and YES, you can absolutely do this yourself at home. No expensive repair bill needed!Grab yours on Amazo...
Published   August 16, 2020
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YouTube
youtube.com › watch
Fixing a leaky shower head (Replacing Delta Monitor Series 1400 Handle Cartridge) - YouTube
In this video we address a leaking shower head and correct the issue on a Delta Monitor 1400 series shower. To fix the problem you need to address issue wit...
Published   July 13, 2021
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JustAnswer
justanswer.com › plumbing › pjh4t-1800-shower-faucet-handlebroken-needs-replacing-delta.html
Delta 1800 Shower Faucet Handle Replacement Guide - FAQ
July 15, 2024 - My 1800 Shower faucet handlebroken needs replacing. Delta eighteen hundred monitor series. A week. Phone call
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YouTube
youtube.com › watch
Delta Shower and Tub Cartridge Replacement: What You Need to Know - YouTube
This video covers everything you need to know about Delta shower and tub cartridge replacement. It explains the different types of cartridges, how to identif...
Published   November 19, 2023