Delta

Cartridge - DIAMOND Valve - 1H

Model#: RP50587

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RP50587 is rated 3.4 out of 5 by 76.
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  • Durable design was built to last
  • Compatible with single-handle kitchen and lavatory faucets
  • Chrome finish provides a shiny, highly-reflective look
Finish: Not Applicable
List Price*: $54.90
Base Parts
RP50587
List Price*: $54.90

Product Support, Repair Parts & Technical Specifications


View Maintenance & Installation Sheet

Installation Information


  • Valve Type: Ceramic valve
Rated 1 out of 5 by from Leaky kitchen faucet I have delta faucet in my kitchen and it started leaking. The price of the cartridge is so high that with same price of this cartridge I can get another brand of the new faucet which can also last 3-4 years. Very disappointed Delta!!!!
Date published: 2019-11-15
Rated 1 out of 5 by from On My Third Cartridge1 I purchased this Addison Faucet sometime back (I can't remember the exact date) but it was 2-6 years ago and I have replaced the cartridge due to dripping at least three times! It is easy to replace but for something that costs so much one would think that it would preform satisfactorily for many, many years. If this situation continues I'll be looking for a faucet that doesn't have this particular type of cartridge.
Date published: 2019-11-12
Rated 2 out of 5 by from Faucet will not shut off completely As I have read in other reviews the RP50587 cartridge has failed. The water will not shut off completely without having to adjust the lever handle to a certain position. I have always used Delta faucets in the past but if this is the new design I may be switching to Moen. It seems like this is a reoccurring issue with this faucet.
Date published: 2019-10-29
Rated 5 out of 5 by from Sink works so much easier now w/no dripping water! Very nice not to have a dripping faucet anymore.
Date published: 2019-10-28
Rated 5 out of 5 by from Easy even for an amateur! I have ZERO plumbing skills, other than replacing some inner parts of a toilet tank, so when i researched that the drip in the faucet was from this part that needed to be replaced, i was skeptical i could do it, but other reviews said it was easy. Sure enough, very easy to do, the faucet works like NEW now, no drip! Go for it!
Date published: 2019-10-24
Rated 1 out of 5 by from Persistent drips If only it would not drip. I have this unit about three years and have replaced the cartridge once already at my cost $50.00 wow. now less than a year later the new cartridge is starting to drip. The old system of springs and seals was much better. Now here I am again about to purchase another cartridge. Expensive but less than a new unit. Please if you cannot make them reliable at least make replacements affordable
Date published: 2019-10-21
Rated 2 out of 5 by from Faucet leaks, runs randomly. 2 1/2 years old. This faucet began leaking after only a year, then failed completely. I took the valve apart and determined the thin white plastic retainer, which holds the base of the lever in place, cracked. The bottom of the lever slips slightly out of the base and the sliding valve is unable to close completely, allowing the water to run.
Date published: 2019-10-02
Rated 1 out of 5 by from Replacement cartridge seems faulty RP50587 I replaced the valve assembly because the water would not shut off. But now have a persistent slow drip that I am not able to stop. This new valve cartridge was quite expensive and still seems to be leaking. Getting quite frustrated with this brand. The old ball was much better.
Date published: 2019-09-12
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are there installations instructions for RP50587?

Asked by: Gene
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
Answered by: Tanya
Date published: 2018-10-03

what is the switch on the top for ?

Asked by: bill c
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
Answered by: Delta Faucet
Date published: 2019-01-31

All that needs replaced is the orange "O" ring on the bottom. Can I purchase these?

Asked by: Mike
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
Answered by: DeltaFaucet7
Date published: 2019-06-28

this part RP50587, Diamond cartridge valve leaks. How do I take apart to repair. I have a parts #RP3614A.

Asked by: David
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
Answered by: Delta Faucet
Date published: 2018-11-24

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.

Asked by: Amber
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
Answered by: DeltaFaucet2
Date published: 2016-06-23

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?

Asked by: Steve_H
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
Answered by: DeltaFaucet11
Date published: 2018-02-20

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.  

Asked by: Heather
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
Answered by: Tanya
Date published: 2018-05-15

I scratched the plastic piece below valve cartridge but cannot find the part number.

The piece I am trying to replace has three holes, sits below the valve cartridge, has three hoses connected to it, and sits on top of a brass ring. What is the part number for this piece? And how can I disconnect the three hoses from it to replace this piece?
Asked by: kj
Hi KJ, Thank you for your question. The puck assembly is not available as a replacement part. If the scratch is bad enough that the valve assembly will not seal onto the puck the faucet will have to be replaced. Thanks, Dave
Answered by: DeltaFaucet2
Date published: 2015-04-21
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