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
Will this cartridge work for a 19922Z-SSSD-DST (Ashton pull-down faucet installed about 7-8 years ago so not sure if the model numbers stay the same)
Hi Valued Customer,
Thank you for your question regarding our 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.
Yes, the 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
(800) 345-3358
customerservice@deltafaucet.com
Date published: 2025-01-16
Warranty coverage re: faulty cartridge . Model 9178-AR-DST(delta Leland). Cartridge # RP50587Y .
Hello,
Please accept our sincere apology for the inconvenience you are experiencing. Please contact us directly by phone at 1-800-345-3358 or email at customerservice@deltafaucet.com as we would like to resolve this matter for you at this time.
Best Regards,
Tim
Digital Communications Specialist
Date published: 2026-08-11
How to install RP50587
Hi Jeannie,
Thanks so much for contacting Delta Faucet Company!
Here is a link to the Cartridge DIAMOND™ Valve Model#: RP50587 Maintenance and Instruction manual:
https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf
Please reach out with further questions!
Best Regards,
Kelley
Digital Communications Specialist
Date published: 2024-08-01
How do I find the proper replacement cartridge for a Delta 23025 single handle faucet? There should be a published lookup table somewhere!
Hello Dave,
Thank you for contacting Delta Faucet Company! I am sorry this information was not readily available, and I am happy to help you!
Our Delta Faucet DELTA® Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587 does not work for the Delta Faucet 23025, I have attached a link to the installation guide below which also has a parts diagram.
https://media.deltafaucet.com/MandI/69913-B.pdf
Thank you for being a loyal Delta customer. Please contact us back for any further questions.
Best Regards,
Nicole
Date published: 2024-03-28
We have a delta kitchen faucet that leaks at the base of the single handle. Will delta honor the warranty and send a replacement handle cartridge?
Replacement Instructions for cartridge RP50587. Model 4353-DST
Hello Bob S,
Thank you for contacting Delta Faucet company. I apologize for the inconveniences you are experiencing and will be happy to help you.
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 of 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 back if you need further assistance.
Best Regards,
Nicole
Date published: 2024-03-28
I need to replace the cartridges on two Leland single handle kitchen/prep sink faucets. I pulled the old cartridge out of one, and it has markings on it that say 29/04/10, GX35, 0407. Is this the same as RP50587?
Does the RP50587 work on a delta 978-D5T
Hi Rodney,
Thank you for your question about the Delta Faucet RP50587.
Yes, this cartridge is used by the faucet 978-DST.
Please reach out with any additional questions!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2026-05-12
Is the valve assembly RP50587 under warranty? I have a Leland Model 978-SD-DST
Hello!
Thank you for contacting Delta Faucet Company!
Our warranty covers parts, finish, and manufacturing defects.
We appreciate your inquiry. Please reach out directly if you have further questions!
Best Regards,
Kyra
Digital Communications Specialist
Date published: 2025-12-08
Is valve assembly rp50587 covered under warranty
Hi!
Thank you for your question! I will be happy to help. Replacement parts that are due to manufacture defect are covered under warranty to the original purchase of the product. Please contact us directly if we can be of further assistance at this time!
Best Regards,
Tim
Date published: 2024-03-28
Is this the correct cartridge for a 9178-DST kitchen faucet with pull-down spout? Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587
Hi Cindy McCord,
Thank you for contacting Delta Faucet Company. Please accept our sincere apology for the inconvenience you are experiencing locating this information. We are happy to assist you.
The Delta Faucet LELAND® Single Handle Pull-Down Kitchen Faucet With ShieldSpray® Technology In Chrome MODEL#: 9178-DST uses the Cartridge - DIAMOND™ Valve - 1H
MODEL#: RP50587. 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
Thank you for being a loyal Delta Faucet customer. We look forward to continuing to serve you. Please feel free to contact us back for further assistance.
Best Regards,
Kelley
Date published: 2024-03-28
Is the RP 50587 Cartridge-Diamond Valve 1-H the correct replacement for the Leland Single Handle Centerset Lavatory Faucet Model #578-RBMPU-DST ?
Hi Lance,
Thank you for your question about the Delta Faucet RP50587.
Yes, this cartridge is a replacement part for the faucet model 578-RBMPU-DST.
Please reach out with any additional questions!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2025-04-04
Installing a cartridge RP 50587. On my one handle model ??? I see no set screw or any way to take the handle off . I have a slight drip when shutting off the water until jiggling the handle. How do t ident the model # ? If I can remove the handl
Hi Ted 148, thank you for your interest in the RP50587!
Usually our set screws are located under the button on the handle. The model number can be found underneath the faucet on the supply line.
Please contact us directly if you have any questions or need additional assistance.
Best Regards,
Digital Communications Specialist
Date published: 2024-03-28
What is the red sliding switch on top of the cartridge for? What determines which side it should be set to?
Hi Gary,
Thanks so much for contacting Delta Faucet Company!
The orange/red switch on the top of the Cartridge DIAMOND™ Valve MODEL#: 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 reach out with further questions!
Best Regards,
Kelley
Digital Communications Specialist
Date published: 2024-04-17
I had a leaky faucet in my bathroom and I went ahead and bought a new cartridge to replace the older one. In spite of it, the faucet is still leaking! Can you help?
Good morning pratap!
Thank you for your review! I apologize for the leak you are experiencing when using the newly installed valve cartridge and I will be happy to help you.
We do recommend flushing the valve when installing new cartridges. It will allow the removal of debris in the lines.
Here are the steps for flushing a single handle lavatory faucet.
Please shut water supplies off before starting this process.
You will need 1/8” Allen wrench if you have lever handles, a Philips screwdriver if you have knob handles, needle nose pliers, a quarter, towel and bucket.
1. We are going to flush the diverter first; to do this we will need to remove the spout. Please unthread the spout bonnet counter-clockwise and pull the spout straight up to remove. Inside you will see a black plastic piece. This is your diverter.
2. Please place your quarter in the slots on the diverter and take your needle nose pliers to twist it out counterclockwise.
3. Place the bucket behind the spout and around ONE of the handles. Please turn both water supplies on. Please flush this out for about 30 seconds to a minute.
To flush the valves:
4. Please remove your handle with the 1/8" Allen wrench if you have a lever or remove the top cap to reveal the Philips screw if you have a knob handle.
5. Please pull the handle off of the stem unit.
6. You will now see a bonnet nut, please remove with your wrench.
7. Please take note of how your stem units are installed in the valve. Please lift straight up to pull the stem units out.
8. If you look into the valve, you should see a seat and spring. Please pull these pieces out before we flush.
9. Please place the towel behind the back of the faucet then put the bucket over the top of the towel.
10. Please have someone turn the cold water supply on for about 30 seconds to a minute. After this, shut the cold water off and move the bucket and towel to the hot side, flush that out as well.
11. Remove the aerator and soak with a 50/50 solution of white vinegar and water for about 15 minutes, and make sure to rinse the aerator off with water when completed.
Please contact back for any further questions.
Best Regards,
Frank
Date published: 2024-03-28
RP50587 Cartridge - 1H Valve What does this kit not come with the rubber seals?
Hi Wanda,
Thank you for your question about the Delta Faucet RP50587 Diamond Seal valve cartridge. I apologize for any difficulty finding this information. I know that can be frustrating. We are happy to help!
The cartridge has a seal on the bottom. A Diamond Seal Technology faucet model that uses this cartridge would not use rubber seats and springs. This cartridge uses a ceramic disc to control the water flow.
Please reach out if you have any questions or need additional assistance. We appreciate your business and look forward to continuing to serve you!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2024-03-28
Hi, I have a leaky faucet handle on my Pilar kitchen faucet 980T-SS-DST. Does this cartridge fit to repair it? Thank you
Hello Andy,
Thank you for your question! We apologize for the leak you are experiencing with your Delta Faucet Pilar® Single Handle Pull-Down Kitchen Faucet With Touch2O® Technology In Stainless MODEL#: 980T-SS-DST. We understand how frustrating this can be and will be happy to help you.
The Delta Faucet Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587 can repair a leaking faucet. We also recommend flushing the supply line.
Leaking is typically caused by the debris. If only one side is affected, there is debris in the supply line. To flush the supply line, first shut off the hot and cold-water supply. Remove the hot supply line from the shutoff valve and place the line into a bucket. Open the handle to the middle position, fully open, then turn the cold supply back on for one minute. The cold water should flow through the faucet and out the hot supply tube. Reconnect the supply line and turn on both supplies.
Thank you for being a loyal Delta Faucet customer. We look forward to continuing to serve you. Please feel free to contact us back for further assistance.
Best Regards,
Kelley
Date published: 2024-03-28
I have a 520-SSMPU-DST faucet that will not shut off properly. It is only a few years old. Is the repair cartridge covered by warranty from Delta?
Hi William, 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
Hello, How could I receive replacement cartridge for my 16970-SD-DST kitchen faucet? Water drips and on the package, it states we have lifetime warranty.
Hello Jared!
Thank you for your question and we are happy to help. For warranty replacement parts, please contact us directly by giving us a call, sending us an email, or contacting us on social media.
Best Regards,
Carrie
Date published: 2025-02-11
I have model 19978Z-SS-DST. Need to replace cartridge as the facet is dripping. Need exact number for ordering
Hi Valued Customer,
Thank you for your question regarding our 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.
The cartridge is 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: 2025-01-17
Is the Cason faucet replacement cartridge covered under Deltas lifetime warranty? If so, how can I order one?
Hi Mike, 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: 2023-03-05
Is this valve a replacement for my Model #19950-RBSD-DST VENETIALN BRONZE SINGLE HANDLE KITCHEN FAUCET?
Hi Gene,
Thank you for your question on our Delta Faucet RP50587! We apologize for any inconvenience you are experiencing, and we are happy to help you!
Yes, the Delta Faucet RP50587 is the valve cartridge replacement for Delta model 19950-RBSD-DST.
We appreciate your business and look forward to continuing to serve you. Please contact us back directly with any further questions.
Best regards,
Kyra
Digital Engagement Specialist
Date published: 2024-03-28
Our kitchen faucet is leaking again, and can only be shut off with the handle using a very specific motion and position. Do I recall correctly that the RP50587 valve assembly has a lifetime warranty ?
Hello!
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: 2026-02-09
I hava a 4353 -dst faucet .im wondering what the orange colored switch is on the cartridge
Hello Rayd!
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.
With any further questions or concerns, please do not hesitate to reach out to us directly. Thank you for being a loyal Delta customer.
Best Regards,
Carrie
Date published: 2024-03-28
I have a delta kitchen faucet, 100-DST series and the faucet leaks from under the handle. I am the original purchaser and I've had this faucet for many years, but before I start looking for proof or purchase, is the cartridge covered by the warranty?
Hi Jack,
Thank you for your question about the Delta Faucet RP50587.
All parts and finishes are covered by our warranty to be free of defects in material and workmanship. For a leak under the handle, tighten the bonnet nut with a wrench, and if the issue remains, we recommend replacing the cartridge.
Please reach out for further assistance or with any additional questions!
Best Regards,
Bryan
Date published: 2025-12-11
Are there step by step directions in how to replace the valve rp50587 on a single handle bathroom faucet?
Hi Kat21,
Thank you for your question about the Delta Faucet RP50587.
The steps are the same as the kitchen faucet step by step. You may need a 3/32” or 1/8” hex wrench to remove the handle.
See instructions here and the Maintenance and Installation sheet for more information:
https://support.deltafaucet.com/s/article/What-do-I-do-if-my-single-handle-kitchen-faucet-drips-from-the-spout-outlet-DST-model
https://media.deltafaucet.com/MandI/116238%20Rev%20A.pdf
Please reach out with any additional questions!
Best Regards,
Bryan
Digital Communications Specialist
Date published: 2024-11-01
This is 2nd time replacing RP50587; last one less than five years ago. New installed and very slow drip (1 drop every 5-10 minutes) leak. White facing surface and orange-seals looked good, not high H20 pressure. Should I put grease on seals?
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 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: 2026-02-25
what is the S and h switch on the cartridge for?
Hi Phil,
Thank you for your question about the Delta Faucet RP50587 Diamond Valve Cartridge. Please accept our sincere apology for the inconvenience you are experiencing finding this information. We will be happy to assist you in resolving this issue as quickly as possible.
The S on the cartridge is a manufacturing code. The H is for hot. Please see the Maintenance and Installation sheet in the link below.
https://media.deltafaucet.com/MandI/64211%20Rev%20A.pdf
Please reach out if you have any questions or need additional assistance. We appreciate your business and look forward to continuing to serve you!
Best Regards,
Themar
Digital Communications Specialist
Date published: 2024-03-28
I have kitchen faucet (19949Z-SD-DTS) is the RP50587 the replacement cartridge ?
Hi Valued Customer,
Thank you for your question.
Yes, RP50587 is the correct cartridge.
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: 2026-02-27
Will this RP50587 fit my gooseneck kitchen faucet # 19912-SSSD-DST?
Hi GeoMag,
Thank you for your question. The RP50587 valve assembly is the correct replacement part for the Delta 19912-SSSD-DST.
Best regards, Simone
Date published: 2024-03-28
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