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.) :
5
Valve Type:
Ceramic valve
REVIEWS
Rated 1 out of
5
by
Amosporr from
Leaky McLeakerson
Leaked after 2 years. Ruined my countertop before I noticed the slow drip leak.
Date published: 2026-06-29
Rated 2 out of
5
by
eritavi from
Second replacement cartridge within a year
This is the second time I’m replacing this cartridge. I replaced it last year and it’s already malfunctioning.
Date published: 2026-06-18
Rated 1 out of
5
by
Daniel from
Junk
Like many other reviews, mine lasted about two years. You know how bad your product has to be to only have a 2.9 review rating? I guess they know they have you over a barrel, since it's buy another one or new faucet.
Date published: 2026-06-03
Rated 1 out of
5
by
Ledge89 from
Poor Quality Cartridge
The product quality is very poor for this particular product. The cartridge typically only lasts about a year before it starts leaking and needs to be replaced. We are on the 5th replacement cartridge so far and it needs to be replaced again after less than a year being installed. We are on city water in the Metro Nashville area and have a filter on the water line as well so the problem shouldn't be with the quality of the water. And I'm having trouble getting through to Delta customer service right now as the 800-345-3358 number is not working either. Very dissappointed in the quality of this product even with the lifetime warranty because I have to change the cartridge every year. And, according to the other reviews I've read on the Delta website, a number of other people are having the same problem. The older style product with replaceable rubber gaskets was much more reliable and easy to service.
Date published: 2026-05-05
Rated 5 out of
5
by
Athena from
Very Useful Features
I love my Leland Arctic Stainless kitchen faucet & Delta has been wonderful since I purchased it from them through Amazon in 2013. They've sent me many free replacement cartridges over the years, & even the water lines & a different spray head since then b/c I was putting up with something that I didn't realize shouldn't be happening. Evidently, this faucet has evolved since 2013 & I'm currently using a head they sent me that has 2 different types of sprays. It's time for a new cartridge under the handle b/c the spray head drips at times which is what happens when it doesn't dock properly as it's done so well in the past. Delta has evidently improved this cartridge also b/c it seems to have lasted much longer than in the past.
Date published: 2026-04-18
Rated 2 out of
5
by
TRJo from
MEH
Faucet leaks often and is hard to get it just right to shut off. Will replace cart and see if that helps. Only 4 years old.
Date published: 2026-04-17
Rated 5 out of
5
by
Hank from
Number one quality sink valve cartridge
This valve cartridge is will designed, easy to replace when it starts getting old and starts dripping. And warranted for life by Delta! Be sure to register your purchase so Delta can replace it if or when it starts leaking. Delta has a wonderful warranty and quick replacement of any of their products!
Date published: 2026-04-14
Rated 5 out of
5
by
bob27 from
Perfect example of our corporate hellscape!
What a Product! It's full of great features like cheap plastic, leaks and profits winning over quality!
Date published: 2026-03-15
Q&A
I watched a you tube video that said this replacement part was free
Hello,
Please accept our sincere apology for the inconvenience you are experiencing. We have reached out to you via email to further assist at this time.
Best Regards,
Tim
Digital Communications Specialist
Date published: 2026-07-08
Will valve cartridge rp50587 fit delta high rise single handle pull down faucet (charmaine) 19962-sssd-dst?
Hi Edward,
Thanks so much for contacting Delta Faucet Company!
No, model 19962-SSSD-DST utilizes the RP73000 cartridge assembly.
Please reach out with further questions!
Best Regards,
Tim
Digital Communications Specialist
Date published: 2024-03-28
Need new single handle cartridge RP50587. Should be covered under warranty by Delta.
Hi Peter,
Thank you for your question regarding our Delta Faucet RP50587.
Please feel free to contact us directly for technical information at 800-345-3358. We are available Monday through Friday from 8 a.m. to 8 p.m. and Saturdays from 9 a.m. to 6 p.m. Eastern Standard Time.
Thank you for being a loyal Delta Faucet customer.
Best Regards,
Themar
Digital Communications Specialist
(800) 345-3358
customerservice@deltafaucet.com
Date published: 2024-01-31
I currently own a Delta faucet "Kate" single handle pull down with soap dispenser that has started to drip when turned off. What is the proper replacement cartridge for the faucet?
Hi Valued Customer,
Thank you for your question, please accept our sincere apology for the inconvenience you are experiencing. We will be happy to assist you in resolving this issue as quickly as possible.
Yes, RP50587 is the correct cartridge.
Please feel free to contact us directly for technical information at 800-345-3358. We are available Monday through Friday from 8 a.m. to 8 p.m. and Saturdays from 9 a.m. to 6 p.m. Eastern Standard Time.
Thank you for being a loyal Delta Faucet customer.
Best Regards,
Themar
Digital Communications Specialist
Date published: 2025-11-07
Can I just purchase a bulk amount of the orange seal inside the cartridge.
Hi Jennifer,
Thank you for contacting Delta Faucet. Please accept our sincere apology for the inconvenience you are experiencing. We will be happy to assist you in resolving this issue as quickly as possible.
Our Delta Faucet RP50587 orange seals are not available to order separately.
Thank you for being a loyal Delta Faucet customer. Please feel free to call, email, or message us on social if you need anything else.
Best Regards,
Themar
Digital Communications Specialist
Date published: 2024-03-28
What does the orange switch do? Does it matter it’s location?
Hi Greg, thank you for contacting Delta Faucet Company!
The orange tab on top of our RP50587 is where you can limit the amount of hot water coming through the faucet. If this cartridge is set to the "half moon" side, you will only get lukewarm water and cold water.
We appreciate your inquiry. Please reach out directly if you have further questions!
Best Regards,
Kyra
Digital Communications Specialist
Date published: 2024-03-28
it looks like this requires a special tool to install. 1. do any tools needed come with this cartridge? 2. are instructions included to install this cartridge?
Hello jbd1,
Thank you for your question about the Delta Faucet model RP50587 Cartridge - DIAMOND™ Valve. I apologize for any difficulty finding this information. We are happy to help!
The cartridge does not include any tools. During installation, a wrench would be used to tighten the bonnet nut securely. The faucet handle is typically removed by loosening the set screw with a hex wrench.
Instructions should be included. Or you can find them here:
https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf
Please reach out at customerservice@deltafaucet.com or 1-800-345-DELTA if you have any questions or need additional assistance. Thank you for being a loyal Delta Faucet customer.
Best regards,
Bryan
Date published: 2024-03-28
what is a bonnet nut, #51503
Hi Valued Customer,
Thank you for your question, please accept our sincere apology for the inconvenience you are experiencing. We will be happy to assist you in resolving this issue as quickly as possible.
The bonnet nut holds the valve cartridge or stem in place.
Please feel free to contact us directly for technical information at 800-345-3358. We are available Monday through Friday from 8 a.m. to 8 p.m. and Saturdays from 9 a.m. to 6 p.m. Eastern Standard Time.
Thank you for being a loyal Delta Faucet customer.
Best Regards,
Themar
Digital Communications Specialist
(800) 345-3358
customerservice@deltafaucet.com
Date published: 2025-02-21
Will the RP50587 Diamond Cartridge fit my 2009 Delta 520 CP Lavatory single handle faucet? The item number is FADE520WFMPU. Thanks TJ.
Hello,
Thank you for your question!
If your model features long, dark grey thin PEX supply lines that connect to the shut-off valves under the sink, then yes it will. If you faucet has copper lines coming directly from the faucet it will not.
Please reach out with further questions!
Best Regards,
Tim
Digital Communications Specialist
Date published: 2024-02-27
How long do these valve assemblies last?
Hello Dil65,
Thank you for your question about the Delta Faucet RP50587 valve assembly. I apologize for any difficulty finding this information. I know that can be frustrating. We are happy to help!
Our patented Delta Diamond Seal® Technology design reduces leak points and lasts twice as long as the industry standard—ensuring leak-free operation for the life of the faucet.
Please reach out at customerservice@deltafaucet.com or 1-800-345-DELTA if you have any questions or need additional assistance. Thank you for being a loyal Delta Faucet customer.
Best regards,
Bryan
Date published: 2024-03-28
Does RP 50597 cartridge fir single lever bathroom faucets in the 500DST grouping?
i have two parts one is a blue gasket and the other is a black and siliver colored what looks like a pumpkin where do they fit in to the cartridge?the cartridge was loose when i removed it from the wraper.
Hi tony,
Thank you for your question about the Delta Faucet RP50587.
The cartridge is not designed to be disassembled. We recommend replacing the cartridge if it has come apart.
Please reach out for further assistance or with any additional questions!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2024-11-07
What is the orange switch for?
Hi Dipper, thank you for your interest in the RP50587!
The orange/red switch on the top of the Delta Valve Cartridge RP50587 is a handle limit stop which is an optional safety feature that can be used to prevent the handle from moving too far to the hot side. When it is switched all the way to the left, the handle can turn to the hottest position. When it is kept to the right, this will limit the handle to turn only halfway to the hot side.
Please contact us directly if you have any questions or need additional assistance.
Best Regards,
Themar
Digital Communications Specialist
Date published: 2023-06-26
I have a leak that can be stopped by pushing down on the handle in a certain manner. Does this sound like it is the valve assembly? On a 16927-SD-DST. Would this be covered under the warranty? We have had the faucet for 8-10 years. Not commercial use.
Hello Andy, I am sorry for the issue and will be happy to help you get this fixed. I'll follow up with you via email for further help with this.
Best Regards, Julie
Phone: 1-800-345-3358 | Email: customerservice@deltafaucet.com |
Date published: 2024-03-28
My handle on the faucet is very hard to move, this part should take care of the issue. I purchased the faucet 4 years ago, is there any warranty assistance on it?
Does the RP50587 act as a diverter valve or is it a separate part. If it is a separate part, what is the part number?
Hi CJBrown,
Thank you for your question about the Delta Faucet RP50587.
This does not act as a diverter for faucets that use this cartridge and have a side sprayer. The diverter is part of the spray and hose assembly. For example RP60097. See the parts diagram for your faucet model for more information:
https://media.deltafaucet.com/PartsDiagram/DPD-K-100-DST%20Rev%20B.pdf
Please reach out with any additional questions!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2024-11-04
I have three bathrooms with Delta bathroom faucets in them- - can I just buy the springs and seats otherwise it's just too expensive to keep Delta faucets and repair them. I I'm pretty sure I need valve assembly rp50587 but can work with just the springs
Hi Rich, thank you for your interest in the RP50587!
We are happy to assist you!
We have reached out to you directly via email in regard to this matter.
Please contact us directly if you have any questions or need additional assistance.
Best Regards,
Themar
Digital Communications Specialist
Date published: 2024-03-28
Does the valve number RP 50586 replace the valve on all of the Leland style faucets
Hello Customer!
Thank you for your question and we are happy to help. The RP50587 is not the replacement for all Leland style faucets. For further assistance with warranty replacement parts, please contact us directly by giving us a phone call or sending us an email.
Best Regards,
Carrie
Date published: 2024-09-13
What does DST stand for?
Hello Valued Customer, Thank you so much for contacting Delta Faucet Company! DST stands for Diamond Seal® Technology. This technology is easier to install and helps your faucet perform like new for life, reducing leak points and lasting twice as long as the industry standard. Please reach out directly with further questions. Best Regards, Kayla
Date published: 2023-06-09
How to replace valve
Hello David 45,
Thank you for your question. We are happy to help!
Installation instructions for the Delta RP50587 valve assembly can be found here:
https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf
Please reach out directly if you have any questions or need additional assistance.
Best regards,
Bryan
Date published: 2024-03-28
What is the little orange button/lever for on the handle valve cartridge? Our handle has gotten very stiff and is hard to turn on and off. Will this button help in that regard?
Hello sojokelly!
Thank you for your question and we are happy to help!
The orange switch on the top of the RP50587 is an adjustment to allow the handle to move farther on the hot side.
Please contact us directly for any further questions.
Best Regards,
Carrie
Date published: 2024-03-28
What’s the red switch for?
Hello Donak,
Thanks so much for contacting Delta Faucet Company!
The cartridge assembly has an integrated handle limit stop that has two positions. Position 1, to the left, allows full handle motion (the full range between “all cold” to “all hot”). The faucet is set in position 1 in the factory. Position 2, to the right, allows half of the normal handle motion (“all cold” to “mixed hot/cold”).
The handle limit stop can be adjusted by the homeowner once the faucet is installed. Setting the handle limit stop in position 2 may help to prevent scalding because it limits the amount of hot water in the mix; however, this handle limit stop will not always prevent scalding because it does not compensate for incoming pressure or sudden water temperature changes.
To change positions of the handle limit stop: remove the handle; move the valve stem to the all cold position so the water is on; change the position of the handle limit stop; turn off the water; reinstall the handle.
Please reach out with further questions!
Best Regards,
Kelley
Digital Communications Specialist
Date published: 2025-04-22
Is there a repair kit for this cartridge ( Delta RP50587 ) ? If there is what is the kit number. Thanks
Hello,
Please accept our sincere apology for the inconvenience you are experiencing. We have reached out to you via email to further assist at this time.
Best Regards,
Tim
Digital Communications Specialist
Date published: 2026-04-28
We have a kitchen faucet, believe it is a Leland model, with single handle and pull out spray nozzle. In a matter of two days hot water has almost ceased to flow, while cold is fine. Is this a cartridge issue? All other faucets working.
Hello Valued Customer,
Thank you for contacting Delta Faucet Company!
We apologize for the issues you are experiencing and we are happy to help! We have reached out to you directly to further assist you with this matter.
We appreciate your inquiry. Please reach out directly if you have further questions!
Best Regards,
Kyra
Digital Communications Specialist
Date published: 2025-02-04
I replaced my Delta Faucet cartridge RP50587 and the one I took out still looks pretty good. Can I purchase just the orange O ring (on the bottom of the valve) so I can have it as a spare? I have 3 of these faucets in my house.
Hi Valued Customer,
Thank you for your question, please accept our sincere apology for the inconvenience you are experiencing. We will be happy to assist you in resolving this issue as quickly as possible.
The orange ring is not available as a separate part.
Please feel free to contact us directly for technical or warranty information at 800-345-3358. We are available Monday through Friday from 8 a.m. to 8 p.m. and Saturdays from 9 a.m. to 6 p.m. Eastern Standard Time.
Thank you for being a loyal Delta Faucet customer.
Best Regards,
Themar
Digital Communications Specialist
Date published: 2026-01-27
Hello. Will this fit model 19949Z-RBSD-DST-R?
Hi Ess R,
Thank you for your question!
Yes, model 19949Z-RBSD-DST-R utilizes the RP50587 cartridge.
Please reach out with further questions!
Best Regards,
Tim
Digital Communications Specialist
Date published: 2024-01-31
Is there an assembly drawing of RP50587? The one I received under warranty fell apart when I removed it from the package. It looks straight forward enough to reassemble. I just need to be sure I'm putting things back in the correct order.
Hello,
Thank you for contacting us at Delta Faucet. I apologize about the issue with your cartridge but am happy to help. We simply don't recommend you try to reassemble the cartridge and install it. I have reached out to you via email at this time to further assist.
Best Regards, Tim
Date published: 2024-03-28
I have a single handle kitchen faucet, model 16926-SSSD-DST that is leaking at the spout. What Valve Cartridge is used in this faucet?
Hi Jack,
Thanks so much for contacting Delta Faucet Company!
The LEWISTON® Pull-Out Kitchen Faucet MODEL#: 16926-SSSD-DST will need the Cartridge - DIAMOND™ Valve MODEL#: RP50587 replaced. Parts can be purchased online or locally. Please see our Where to Buy page for help finding dealers in your area or online.
https://www.deltafaucet.com/where-to-buy
Please reach out with further questions!
Best Regards,
Kelley
Digital Communications Specialist
Date published: 2024-03-29
delta Kitchen faucet:My cartridge needs replacement, faucet dripping constantly. Delta still have lifetime warranty? How do I order the replacement part
Hi Valued Customer,
Thank you for your question, please accept our sincere apology for the inconvenience you are experiencing. We will be happy to assist you in resolving this issue as quickly as possible.
Please feel free to contact us directly for technical information at 800-345-3358. We are available Monday through Friday from 8 a.m. to 8 p.m. and Saturdays from 9 a.m. to 6 p.m. Eastern Standard Time.
Thank you for being a loyal Delta Faucet customer.
Best Regards,
Themar
Digital Communications Specialist
(800) 345-3358
customerservice@deltafaucet.com
Date published: 2025-01-31
How do I request a replacement valve for my faucet?
Hello,
Please accept our sincere apology for the inconvenience you are experiencing. We have reached out to you via email to further assist at this time.
Best Regards,
Tim
Digital Communications Specialist
Date published: 2026-06-02
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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.