Delta

Cartridge - DIAMOND Valve - 1H

Model#: RP50587

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RP50587 is rated 3.6 out of 5 by 69.
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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 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
Rated 1 out of 5 by from Fails too Quickly Have had my kitchen faucet only two years and already the faucet leaks by/handle won't turn off at center position. Come to find out its the cartridge and now find out a replacement cartridge is $50 plus? Really? Second-guessing my choice of Delta over Moen...did I make a mistake?
Date published: 2019-09-09
Rated 2 out of 5 by from Poor design. We have hand this faucet for 3 years now and it has actually been failing for about a year and finally failed completely on us. Of course it would be when were having guests so we went for the quick solution and paid the $40 for a new replacement cartridge at the local hardware store. Expensive but, had to be done.If you're in the market for a new kitchen faucet, I would advise against one that uses this style cartridge.
Date published: 2019-09-08
Rated 2 out of 5 by from Replacement cartridge seems faulty Good taps in the kitchen that have served me well for a number of years. But persistent slow leak happening for the last while. Mostly from the base of the tap. Picked up a new replacement cartridge and still seems to be leaking. Getting frustrated with this brand.
Date published: 2019-09-05
Rated 1 out of 5 by from Water can't shut off completely I bought this product only 1 year ago, and now it can't shut off the water completely.
Date published: 2019-09-05
Rated 1 out of 5 by from bad design I bought this product 4 years ago. The cartridge broke down every two years. Now I have to buy the second replacement. Bad design.
Date published: 2019-09-04
Rated 3 out of 5 by from Leaky Faucet I have delta products throughout the house because they've been a trusted product, but like most of these reviews.... I’m having the leaky faucet issue - where it doesn’t shut off completely. Looking to repair and realized that the cartridge is very expensive..... maybe it is time to change brands.
Date published: 2019-08-12
Rated 2 out of 5 by from Kitchen water faucet will not completely shut off My Delta kitchen faucet is only 4 years old. For the past year, it will not shut off unless I rotate the handle in a circle and leave it on the cold side. If I forget to follow this procedure, it will leak every time, sometimes leaking all day long. Bad cartridge design. It used to be that you could buy a product and it would last for years. Not any more.
Date published: 2019-07-21
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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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