Delta®
Cartridge - DIAMOND™ Valve - 1H
Model#:
RP50587
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PRODUCT FEATURES
Documents & Specs
Product Support, Repair Parts & Technical Specifications
Installation Information
Overall Height (in.) :
2-1/2
Valve Type:
Ceramic valve
REVIEWS
Rated 1 out of
5
by
Jeff J from
Continue to have issues with Delta Cartr. RP50587
The last time I replaced our RP50587 cartridge was in January 2020. Delta provided that replacement cartridge. Now it is January 2024 and the same problem. Actually the cartridge has been bad for a while. I cannot remember when it went bad but I'd guess about at least 18 months ago. It does the same thing, leaks/drips unless we have the faucet handle in the right spot. Delta can we get another replacement cartridge? Thank you.
Date published: 2024-01-23
Rated 1 out of
5
by
Tinker from
Needs to be redesigned
I have replaced this cartridge several times and have experienced the same problem over and over. It fails to shut off without dripping most the time requiring handle wiggling to find a sweet spot. I have used Delta parts as well as knock offs with the same results.
Date published: 2023-12-29
Rated 5 out of
5
by
Diana from
Convenient
The part for my faucet came in a couple days after I ordered it. Save me a 45 min trip to another town.
Date published: 2023-12-24
Rated 2 out of
5
by
Mrrepeat2023 from
Lifetime Warranty brings mixed thoughts
This faucet was installed new in early 2015. We liked the faucet. It looked nice and served us well to a point. The original valve failed a few years ago. I contacted the Delta and went through the steps to get a replacement shipped to me. I installed the replacement valve, and all was well. The replacement valve did not last as long as the original. During summer of 2023 we began the task of getting the handle just right so it would shut off completely. It now will not seal off and leaks a very steady stream. My faith in this product is damaged.
Date published: 2023-11-26
Rated 1 out of
5
by
JenM from
Needs to be replaced every 2 years! :-(
It’s great that my Delta faucet has a lifetime warranty but this is the third time since 2017 that I have had to replace the cartridge with valve assembly. Since I have to pay someone to do the replacement for me, it feels like I am paying for this faucet over and over again.
Date published: 2023-11-06
Rated 1 out of
5
by
tracey from
Doesn't last
I am replacing this cartridge in my Delta kitchen faucet (9178-SP-DST) for the 3rd time since it was purchased in 2020. They last maybe about 1.5 years. The faucet operation stiffens and starts to drip nonstop; then becomes impossible to shut off. I also have this same mechanism in two other Delta bathroom faucets (15999-SS-DST) and one is starting to dip as well. I think they redesigned the original design, but I am unsure what version I have. The problem exists and replacement, while easy, is frustrating. I feel I will stay away from a Delta product when I make my next faucet purchase.
Date published: 2023-11-02
Rated 1 out of
5
by
AmyH from
Delta faucets don’t last
The cartridges on these models are made to fail in less than 2 years. Never again will I pay for delta.
Date published: 2023-08-26
Rated 5 out of
5
by
Josh T from
Fixed my leak
I noticed a small drip coming from my faucet when the handle was in the "Off" position. Called customer service and discussed the issue. They sent this part as the replacement. Easy swap, out with the old and in with new. Presto! No more leak.
Background: We built our home 11 years ago and this is the original kitchen sink faucet. Family of 5, so this thing has seen lots of use. Very happy with my Delta purchase and their lifetime warranty. If this new cartridge last 11 years like the previous one, then I'll be a happy camper. Thanks Delta
Date published: 2023-05-10
Rated 5 out of
5
by
Anonymous from
Worn out valve ("O" rings within valve)
This replacement valve corrected the worn-out "O" rings of the old part; no more leaking!
Date published: 2023-03-23
Rated 1 out of
5
by
Jskar from
Beware!
Loved this kitchen faucet UNTIL we left for vacation and a small leak from the handle ran down the stem and under the sink while we were gone. Gallons of water ran onto the floor and into the basement before my son visited and managed to fix the leak.
If you buy this brand, be sure to add in the cost of a plumber !!!
Date published: 2023-03-22
Rated 2 out of
5
by
kj60 from
good for one a year
We have had to replace this thing twice in three years because they start to drip .... kinda expensive so would not recommend this type of faucet.
Date published: 2023-03-22
Rated 5 out of
5
by
DouglasHL from
Product fixed my problem!
Delta’s website was easy to use. The only complaint I had, was that the “tracking information” sent to me was not correct. But, the part arrived in 7-10 days as promised with normal (free) shipping.
Date published: 2023-03-11
Rated 5 out of
5
by
Cook and bottle washer from
Part for kitchen sink faucet
Orered this part for our kitchen sink faucet. It arrived in 2 days. Easy for husband to install and works just like new. What more could you ask for?
Date published: 2023-03-04
Rated 1 out of
5
by
Sonny from
Leaked from the beginning
We bought a new Ashton kitchen faucet in May 2022. The cartridge has leaked from the beginning. I can only imagine the hassle I will encounter to try to get Delta to send me a new one under the warranty.
Date published: 2023-02-27
Rated 5 out of
5
by
Anonymous from
Delta cartridge
Easy to install and performance is great thus far.
Date published: 2023-02-27
Rated 3 out of
5
by
kimbeagle from
Correct part
This is the second time replacing this part. It seems to last about 4 to 5 years then starts to go bad. I don't mind replacing, but the price is a joke, $54 for a part that probably costs $5. Nice of you offer free shipping. Which brings me to why so big of a box?
Date published: 2023-02-22
Rated 5 out of
5
by
TJ DIY from
Easy - Peasy Replacement!
Though disappointed my 7-year-old kitchen faucet started dripping, I was surprised & pleased the design included a widely used replaceable cartridge that installed from “above” the sink. Delta sent one no-cost and a 15 minute install. I didn’t have the torque wrench or large (1-5/16 in.) socket the directions suggested but got it done with tools on hand. Works well so far. Excellent customer support - thank you!
Date published: 2023-02-10
Rated 1 out of
5
by
Ron Baldwin from
My Mistake in Buying this Delta Faucet
I purchased a Delta faucet from Home Depot approx 4 years ago and now I find that a key replacement part (RP50587) is very expensive relative to the cost of the faucet (back then). This is ridiculous, but my mistake. Anyone want to gues which brand/company that I won't buy from in the future?
Date published: 2023-01-28
Rated 1 out of
5
by
TWM0 from
TOTAL JUNK
I was so happy to have found a replacement. That was the good part.
The replacement began exhibiting the same exact issue as the old one within minutes of replacement.
I took the valve apart to find what feels like a disc made of bar hand soap. This disc is directly actuated by the handle and is insanely under spec, strength wise. The handle had wallowed it out within MINUTES.
I feel as if someone played a prank on me.
The valve assem
Date published: 2023-01-22
Rated 5 out of
5
by
JimA from
Fixed the Problem
I was a bit disappointed that my Delta kitchen faucet started leaking after only 2 1/2 years of use. However, replacing the valve was relatively easy and fixed the leak.
Date published: 2023-01-10
Rated 5 out of
5
by
mailbagman2000 from
Works great
Only took me about 20 minutes to replace. Watched how to do it on Youtube.
Date published: 2022-12-17
Rated 1 out of
5
by
judg87 from
leaks often
I am on my 4th replacement in 3 years. i have changed water pressure in my home, hot water temperature, mounting torque, nothing seems to change the lifespan. water is not overly hard. one day it just starts leaking and i have about 2- 3 weeks before it becomes an annoying stream. my last home i bought one of the cheap knock off faucets from amazon, lasted 4 years with not a single replacement part. as a long time homeowner of delta products, this little gem is absolutely substandard. for the premium price of the faucet and replacement parts, its a little disappointing.
Date published: 2022-12-16
Rated 1 out of
5
by
Bernard P from
Doesn’t last
I had a leaking kitchen faucet, and replaced the cartridge. In less than a year, it is starting to fail again. This should last a lot longer than that.
Date published: 2022-12-08
Rated 5 out of
5
by
AvgHomeowner from
Excellent product,
Good instructions for average homeowner.
Date published: 2022-12-01
Rated 1 out of
5
by
Ihatethenewdelta from
If you buy a faucet with this in it, good luck!
I have had the new faucet a year and this is my third replacement. The delta faucet in our kitchen uses the older type and I have replaced it twice in 13 years.
Date published: 2022-11-22
Rated 1 out of
5
by
Thomas from
Worthless - 2 Year Lifespan
I used to recommend Delta Faucets on a regular basis because of their quality and their easy, low cost maintenance. With older Delta Faucets, they would go for 8 or 10 trouble free years before a small drip develops, then you replace the seats and springs for less than $5, and it would be like new again. With the Delta "Diamond" technology, you are lucky to get 2 years of service before it becomes difficult to shutoff, then you are in it for $40 for a new cartridge that you know will fail again in 2 years. I guess Delta was not making enough money selling quality products. I generally do not leave reviews, but this was a particularly poorly designed product that has ended my preference for Delta Faucets.
Date published: 2022-10-11
Rated 3 out of
5
by
johnb from
2nd replacement in 6 years
House was built in 12/17. This is the 2nd time I am replacing this part. I dont know if others are having this issue? could hard water be causing it to fail?
Date published: 2022-10-01
Rated 5 out of
5
by
brent43 from
great repair
Had slowly leaking kitchen faucet which was 10+ years old. Still had product manual which clearly indicated most likely problem. Ordered online recommended replacement. Quick response, easy installation (needed 12 inch adjustable wrench), and now works fine.
Date published: 2022-07-27
Rated 3 out of
5
by
Dan919 from
WORKS WELL UNIL IT DOESN’T
This is the second time I’ve had to replace this part. Gets to be kinda expensive at $50.00 a whack.
Date published: 2022-07-25
Rated 1 out of
5
by
Stuart from
Poor design. Fails quickly
The RP50587 lasts maybe 6 months. I have started buying 2 at a time so I have an extra handy. The last one started leaking within weeks. I am on my 4th replacement. It's an expensive part to replace. Very disappointing from a big name like Delta.
Date published: 2022-06-26
Q&A
are there installations instructions for RP50587?
Hello Gene,
Thank you for your inquiry! Yes, the Delta Valve cartridge assembly RP50587 does come with installation instructions on the back of the package it comes in. I have included the Maintenance/Installation document link, below.
https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf
Best regards,
Tanya
Date published: 2024-03-28
what is the switch on the top for ?
Thank you for your question, bill c! The switch on the top is a Handle Limit Stop, which allows you to either have the full range of motion for temperature control or to limit the handle from going to the hot side.
Best regards, Jon
Date published: 2024-03-28
All that needs replaced is the orange "O" ring on the bottom. Can I purchase these?
Hi,
We thank you for your question. The gasket on the Delta RP50587 cartridge is not a item that can be purchased separately. The entire cartridge must be ordered.
Best regards,
Brandis
Date published: 2024-03-28
this part RP50587, Diamond cartridge valve leaks. How do I take apart to repair. I have a parts #RP3614A.
Thank you for your question, David! I'm sorry for any confusion about these replacement parts and happy to clarify. The RP3614 repair kit does not fit into the DST cartridge RP50587. This cartridge is not designed to be serviced and does not have repair parts available. If this cartridge needs replaced or if you need further assistance with this repair, please contact our customer service team directly at 1-800-345-3358 Monday-Friday: 8a.m.-8p.m. EST and Saturday: 9a.m.-6p.m. EST or via email at customerservice@deltafaucet.com.
Best regards, Edward
Date published: 2024-03-28
When replacing part# RP50587, what is the best process for removing the bonnet nut? Is a special wrench required? Diffcult to tell where to loosen.
Hi Amber, Thank you for your question. The RP50587 can be removed using an adjustable wrench. The top of the bonnet nut will have the flat edges where the wrench is positioned. Here is a link to the How to replace the DST cartridge.
http://www.deltafaucet.com/shopping-tools/research/video-gallery/video.html?v=1KMlxNiWni8&cat=
Thanks,
Dave
Date published: 2024-03-28
Can you send me instructions on how to replace this psrt
Hello!
Please see the following link for an installation video for the RP50587.
https://www.youtube.com/watch?v=DxVOPo9TPTI
Please reach out with further questions!
Best Regards,
Tim
Digital Communications Specialist
Date published: 2026-03-30
I have a 9178 delta kitchen faucet and the handle is becoming hard to move and squeaks. It appears that I need a Cartridge - DIAMOND™ Valve - 1H Model#: RP50587. Is this is correct, are there any special tools I need for this project?
Hi, Steve_H!
Thank you for your question, and I am sorry to hear that you are experiencing an issue with your Delta faucet. The correct valve cartridge assembly is RP50587. You will need a 1/8" allen wrench to remove the handle assembly. You may also need an adjustable wrench to loosen the bonnet nut around the valve cartridge assembly. Please be sure to turn off the water at the shut off valve before removing the handle.
Best Regards,
Rosanna
Date published: 2024-03-28
Is this the cartridge for the 955-DST? Also, is the cartridge the same quality wherever we purchase it? We would like to buy one and replace it today.
Hello Heather,
Thank you for your inquiry! Yes, the RP50587 is the correct cartridge assembly for the Delta Victorian Pull-Down Kitchen 955-DST faucet.
All Delta faucets and parts feature the same quality parts, materials, and workmanship, no matter what kind of dealer sells them. Delta retail dealers usually sell faucets that include the handles in the boxes. Plumbing professionals and Delta Studio Showrooms sell faucets where the faucets and handles are packaged and sold separately ("LHP" models), giving the customer some additional styling choices. However, the quality of all Delta faucets and parts are the same.
Best regards,
Tanya
Date published: 2024-03-28
Delta Online Pricing
This online price is exclusive to DeltaFaucet.com. The list price may be shown on products offered outside of the Outlet section on DeltaFaucet.com. Strikethrough pricing may be used to show discounts.