Delta®

Cartridge - DIAMOND™ Valve - 1H

Model#: RP50587
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Delta®
Cartridge - DIAMOND™ Valve - 1H
Model#: RP50587
List Price: $77.10
Online Price: $61.68
Free Ground Shipping All Orders $49+
Add to Favorites
Find local Delta® installers.
PRODUCT FEATURES
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Installation Information
Overall Height (in.) :
5
Valve Type:
Ceramic valve
REVIEWS
Rated 1 out of 5 by 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 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 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 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 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 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 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 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
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Q&A

Is this a suitable alternative for the RP73000? Installing on a Charmaine kitchen faucet.

Asked by: Roswald
Hi Roswald, Thank you for your question about the Delta Faucet RP50587. RP50587 is not interchangeable with RP73000. Charmaine kitchen faucet models including 19962-SD-DST use RP73000 as a replacement cartridge. Please reach out with any additional questions! Best Regards, Bryan Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-06-25

Our recent purchased part, RP50587, is only allowing access to hot water. When we move the handle to the right, no water comes out of the Leland 978-RB-DST faucet. Handle stop set to position 1. What to do? Return?

Asked by: golfAZ
Hi golfAZ, 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
Answered by: Customer Service
Date published: 2024-10-07

How long are these supposed to last? We've replaced it once. Is there any warranty after one replacement? The first one was free.

Asked by: Wehrmacher
Hi Wehrmacher, Thanks for your question regarding RP50587! Our faucets come with a Lifetime Limited Warranty and I have included the link to the warranty below. https://www.deltafaucet.com/warranty Please feel free to contact us with any questions or for further assistance. Best Regards, Emma Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-03-28

What is the model # 4 the faucet that takes cartridge #RP50587 ? And is this cartridge under lifetime warranty ?

Asked by: Frank

Will this fit the Michael Graves 187-WF?

Asked by: Scott
Hi Scott, Thank you for contacting Delta Faucet Company! No, our 187-WF is a ball-type valve. It uses seats and springs, a ball, and cam & packing. Please refer to the link below for more parts information! https://media.deltafaucet.com/PartsDiagram/Models_186_187.pdf We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Engagement Specialist
Answered by: Customer Service
Date published: 2024-02-08

The delta cartridge for our pull down kitchen faucet already needs replaced, as well as one of our bathroom faucets is having the same issue and we believe the cartridge also needs replaced. How long is this part warrantied for?

Asked by: Jenn
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 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
Answered by: Themar
Date published: 2026-01-22

Do I turn off water line under sink to faucet

Asked by: Barry
Hello! Yes, you will need to turn the water off under the sink before removing or replacing the faucet. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Digital Specialist
Date published: 2026-04-20

What is the purpose of the orange lever.  It looks like it should move but mine doesn’t.   

Asked by: Leany

Does Delta replacement cartridge RP50587 work with Delta Faucet Model Lewiston?

Asked by: Cris
Hello Cris, Thank you for your question. I will be happy to answer that for you. If it is a newer model of faucet with the DST version, then yes, the RP50587 will work. Our DST version came out in 2008. If you have any further quesions, please contact us back Best Regards, Julie Phone: 1-800-345-3358 | Email: customerservice@deltafaucet.com |
Answered by: Delta7
Date published: 2024-03-28

It is my understanding that Delta Faucets carry a Lifetime warranty for replacement parts. If so, would my kitchen unit covered for the cartidge

Asked by: Joe A
Hello Joe A, Thank you for your question! We will be happy to help you today! Delta Faucet Company warranties all parts and finishes to be free from defect to the original consumer purchaser for the duration that they own the residence the model is installed in. For full details on the Lifetime Limited Warranty, please click on the link below. https://www.deltafaucet.com/service-parts/warranty Please contact us back for any further questions. Best Regards, Emma
Answered by: Delta7
Date published: 2024-03-28

Is this made by Lasco?

Asked by: Cary
Hi Cary, Thank you for your question! Yes, this cartridge is made by Masco. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Customer Service
Date published: 2023-06-16

I have a Leland 978--DST single pull down kitchen faucet. The single level handle which turns the water off and on does not shut off water completely and drip occurs. Is this the cartridge that needs to be replaced and if so, what is the part number?

Asked by: Michele
Hello, Thank you for contacting us. I apologize about the issue with your faucet but am happy to help. I have reached out to you via email in order to further assist. Best Regards, Tim
Answered by: Delta
Date published: 2024-03-28

How to replace the cartridge RP50587Y

Asked by: zampRP
Hi zampRP, Thanks so much for contacting Delta Faucet Company about RP50587! Looking into this, I have found instructions to replace your RP50587. Please refer to the information below. I apologize again for any inconvenience this may cause. Please shut off the water supplies, gather your 1/8" allen wrench, wrench and strap wrench before we begin. 1. Please remove your handle with the 1/8" allen wrench. There may be a button you can remove with your finger nails first. 2. Once you remove the handle, you should see the cap, or sleeve assembly. Remove this with your strap wrench if you cannot remove it with your hand. 3. After the cap or sleeve has been removed, you should see a brass bonnet, please use your wrench to remove this part. 4. Your cartridge is now free to be removed. Please ensure there is no debris on the puck piece inside the valve. If there is, please grab q-tips or paper towels to clean it out. 5. You are now able to install your new cartridge. Please contact us directly if you have any questions or need additional assistance. Best Regards, Nicole Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-01-31

Will this cartridge fit model 16935-SSP-DST?

Asked by: Pam F
Hello Valued Customer, Thank you so much for contacting Delta Faucet Company! This is the required cartridge for the 16935-SSSD-DST. Please reach out with further questions. Best Regards, Kayla
Answered by: Customer Service
Date published: 2024-03-28

How do I change it

Asked by: Flia
Hi Flia, Thank you for your question about the Delta Faucet RP50587. Please see the installation instructions below and additional information if needed: https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf https://support.deltafaucet.com/s/article/What-do-I-do-if-my-single-handle-kitchen-faucet-drips-from-the-spout-outlet-DST-model Please reach out with any additional questions! Best Regards, Bryan Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-05-24

RP50587 there is a washer just below the nut. is there a replacenemt part for this? Im repllacing the single handle catridge now but think I should alsp replace the o-ring washer as well.

Asked by: Dave
Hi, Dave! I want to thank you for your question. I am happy to help. The ring that you are speaking of is actually apart of the bonnet nut itself (RP51503). This is not a water sealing ring. This ring prevents the faucet body from touching the nut. It is typically only replaced when the nut is damaged. Please contact us directly if you have any further questions. Best Regards, James
Answered by: Delta7
Date published: 2024-03-28

Can Delta RP60114 replace Delta RP 50587?

Asked by: Dr bond
Hi Dr Bond, Thanks so much for contacting Delta Faucet Company about RP50587! No, the cartridges fit into different body's of the faucet. I am sorry if you were not able to find the RP50587, the cartridge can be purchased online or locally. Please contact us directly if you have any questions or need additional assistance. Best Regards, Nicole Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-02-20

What does the switch do that is in the upper left side of the picture? My faucet was dripping, but I just toggled the switch and it is working great now. But, I don't know what the switch actually does!!

Asked by: Nolan
Good morning Nolan, Thank you for contacting Delta Faucet Company regarding our DELTA® faucet Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587. I am sorry this information was not readily available, and I am happy to help you! The 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 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. Thank you for being a loyal Delta customer. Please contact us back with any further questions. Best Regards, Themar
Answered by: Delta
Date published: 2024-03-28

I bought and received the part #50587. I was told that instructions would be included. Not so. Is there a youtube? Have no idea how to install

Asked by: Papa Gene
Hi Papa Gene, Thank you for your question about the Delta Faucet RP50587. Please accept our sincere apology for the inconvenience you are experiencing. We are happy to help! See instructions to replace this cartridge here: https://support.deltafaucet.com/s/article/What-do-I-do-if-my-single-handle-kitchen-faucet-drips-from-the-spout-outlet-DST-model Please reach out with any additional questions! Best Regards, Bryan Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-04-23

Is this the correct valve cartridge for the PILAR 4380-rb-dst? installed in 2023 Would this part still be under warranty?

Asked by: vicki az
Hello Customer! Thank you for your question and we are happy to help. This is the correct part and we offer a lifetime limited warranty. With any further questions or concerns, please do not hesitate to reach out to us again. Best Regards, Carrie
Answered by: Carrie
Date published: 2025-12-04

Will this replace the valve for “kate 16970-sd-dst” ?

Asked by: Carm
Hi Carm, Thank you for contacting Delta Faucet Company! Please accept our sincere apology for the inconvenience you are experiencing. Here is what we can do to resolve your issue for you. Our Delta Faucet Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587 is the correct part for the Kate 16970-SD-DST to repair a leak or drip when off. Please see the link to the parts diagram below. https://media.deltafaucet.com/PartsDiagram/DSP-K-16970-SD-DST.pdf Thank you for being a loyal Delta Faucet customer. We appreciate your business and look forward to continuing to serve you. Please contact us back with any further questions. Best Regards, Nicole Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-03-28

WILL RP50587 FIT A DELTA SINGLE HANDLE PULL-DOWN FAUCET WITH TOUCH20 MODEL #9113T-RB-DST

Asked by: CHERYL
Hello! No, model 9113T-RB-DST uses the RP73000 cartridge. https://www.deltafaucet.com/parts/product/RP73000.html Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Digital Specialist
Date published: 2026-04-30

I need a New valve for my kitchen single handle faucet,PN RP50587. Is this part warrantied for life? 

Asked by: Kneathery
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
Answered by: Themar
Date published: 2025-12-03

how do I get this part under warrenty on line. part no.rp50587

Asked by: djattexas
Hello Anonymous, Thank you for your question! I would be more than happy to assist today. Our products have a Lifetime Limited Warranty that covers parts and finishes to be free of defects in material and workmanship for the original owner/purchaser. Electronic parts have a 5-Year Limited Warranty. To obtain any warranty parts please contact our Please contact us back for any further questions. Best Regards, Kayla
Answered by: Delta7
Date published: 2024-03-28

Can I get a free replacement for part number RP50587 for a leaky faucet model number 400DST?

Asked by: Ethel Kosoff
Hello Ethel! Thanks for your question. I will be happy to assist you with this. Our products have a Lifetime Limited Warranty that covers parts and finish to be free of defect in material and workmanship for the original owner/purchaser. Electronic parts have a 5-Year Limited Warranty. Please contact us directly with any further questions or concerns. Best regards, Paul
Answered by: paul
Date published: 2024-03-28

Can I get this as a replacement as part of a lifetime warranty? If so, how? I looked at the link from the Delta rep above, but when I click through, the "lifetime limited warranty" was for the original owner/purchaser (a previous owner installed it.)

Asked by: Kit37

I have had this valve for only a few years and it is leaking badly. Is it under warranty?

Asked by: Mike

Will this cartridge fit a Delta Lakeview kitchen faucet? Model #59963-SSSD-DST. If not, can you point me to the correct cartridge please?

Asked by: Kristina S
Hi Kristina S, Thank you for your question! Yes, the RP50587 cartridge is designed for use in model 59963-SSSD-DST. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-01-31

How do the internal parts of Delta RP50587 fit together. I took it out of package and it fell apart. I don't know how to fit together again.

Asked by: Dan5065
Hi Dan5065! Thank you for your question and we are happy to help. The Delta RP50587 will need to be replaced. Please contact us directly for further assistance. Best Regards, Carrie
Answered by: Customer Service
Date published: 2024-01-31

I have a leaky faucet, believe the problem is with the diamond valve. I am the original owner, is this product under warranty? 

Asked by: Mark
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
Answered by: Digital Specialist
Date published: 2026-06-01
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