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
Documents & Specs
Product Support, Repair Parts & Technical Specifications
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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

I need a New valve for my kitchen single handle faucet,PN RP50587. Is this part warrantied for life? Installation was 5yrs ago.

Asked by: Stu1622
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: Timothy
Date published: 2026-05-14

Are the replacement cartridges Rp60587 made in the USA, or made in china?

Asked by: G Burly
Hello, Thank you for your question! As a global manufacturer, we source and assemble a number of parts around the world. No matter where in the world our products are sourced, manufactured, or assembled, they are built to Delta Faucet Company's exacting specifications and are quality tested to ensure long-lasting performance. The location information on the back of the box will tell you where your specific faucet model was made. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Timothy
Date published: 2026-05-13

Good evening. Can you please tell me what the outage tab is for on top of the cartridge? Thanks

Asked by: Coshzaco
Thank you for your question, Coshzaco! 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. Best regards, Tanya
Answered by: Delta Faucet
Date published: 2024-03-28

I have this faucet: https://www.deltafaucet.com/kitchen/product/9158-SB-DST.html   Does the Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587 fit it?

Asked by: Mary
Hello, Thank you for your question! Yes, this model uses the RP50587 cartridge. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Timothy
Date published: 2025-03-13

I have a Delta SAXONY® Single Handle Pull-Out Kitchen Faucet model#: 473, that is leaking at the Handle when I shut it off. Is this the replacement cartridge for this faucet?

Asked by: CeeJay
They all leak. New ones may last a year or two before leaking but it WILL drip!  It’s not in the water line, it’s the cartridge and all you can do is cash out $50 and replace it your self. 
Answered by: Jack
Date published: 2024-08-27

Will this for the Jordan kitchen faucet?

Asked by: Jordan faucet
Hello, Thank you for your question! Yes, this cartridge is used in the Jordan pull-out kitchen faucet model 16930-SSSD-DST. Please reach out with further questions! Best Regards, Tim Digital Communications Specialist
Answered by: Timothy
Date published: 2025-01-28

Does RP50587 fit the Zalia faucet, 19781Z-SPSD-DST

Asked by: Carolyn
Hi, Carolyn! Thank you for your question. The Delta 19781Z-SPSD-DST faucet uses RP73000 valve cartridge assembly. Best Regards, Rosanna
Answered by: Delta Faucet
Date published: 2024-03-28

my kitchen faucet (delta saville bronze single handle pull down with sprayer) is leaking. i did some research and looks like i need a cartridge (part # RP50587). I've read that this part is life time warranty. how can i order this part? thanks

Asked by: leo the lion
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: Timothy
Date published: 2025-01-21

Are any other seals or parts required? Do i simply pull out the old cartridge, clean the area, then put in the new cartridge

Asked by: HUCK
Thank you for your question, HUCK! Typically if there is an issue with the function of the RP50587 cartridge, debris has entered the water lines and is trapped in the cartridge itself. Once the water is off and the cartridge is removed, it's advisable to clean the valve body thoroughly as well as perform a flush. This involves placing a bucket over the empty valve body, having a helper turn the water supplies back on fully for a minute or more while the water is directed into the sink. This ensures that any further debris is removed from the assembly and lines. Otherwise there are no other parts needed unless the bonnet nut appears to be damaged. Best regards, Edward
Answered by: Delta Faucet
Date published: 2024-03-28

If Faucet has a lifetime guarantee why does the valve assembly RP50587 for 100DT cost 49.74 ?

Asked by: Jim W
Thank you for your question, Jim W! I apologize for the confusion with the Lifetime Limited Warranty and would be happy to clarify. Per the warranty, any parts that prove defective will be replaced, free of charge, for as long as the original owner has this product installed in their home. Replacement parts can be obtained by contacting the warranty department 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. Parts are also sold at our local and online retailers for second owners and commercial properties that are out of warranty. Best regards, Edward
Answered by: Delta Faucet
Date published: 2024-03-28

orange buttom on top, does that control water flow & are new ones set at max flow

Asked by: bubba
Hi Bubba, Thank you for your question. The orange button on the RP50587 valve assembly is the handle limit stop. The stop limits the handle motion to the hot water side. The cartridge comes in the full range setting. I have attached the portion of the manual that covers the HLS below. Thanks, Dave
Answered by: DeltaFaucet2
Date published: 2024-03-28

Hi.  I bought the 16971-DST 5.5 years ago. The handle has been very hard to turn on and off water.  When shutting off the water, it won’t turn off cleaning,water just drips.  manual indicates this part - RP50587 -as the valve assembly..is this the issue?

Asked by: 16971SSSDDST

I am trying to replace this in my faucet (400-DST-L) and cannot get the bonnet nut off. The directions give NO information about this. How should it be removed???

Asked by: AAmy
Hello AAmy, Thank you for your question! I would be more than happy to assist today. All of our bonnet nuts loosen by turning counter-clockwise. We recommend using a strap wrench and to apply force around the bonnet nut. A strap wrench also is "soft" so it will not damage the finish. If an adjustable wrench or pliers must be used, protect the bonnet with electrical or duct tape and have full contact with the wrench. Please contact us back for any further questions. Best Regards, Kayla
Answered by: Delta7
Date published: 2024-03-28

I am looking to replace the cartridge for my 978-AR-DST faucet. Is this the proper cartridge?

Asked by: Geoff
Hello Geoff, Thank you for your question. We are happy to help! The RP50587 is the cartridge used in the 978-AR-DST faucet. Please reach out directly if you have any questions or need additional assistance. Best regards, Bryan
Answered by: Delta Faucet
Date published: 2024-03-28

Are kitchen faucet Parts covered by lifetime warranty?

Asked by: Churchillcrew
Hello Churchillcrew, Thank you for your question, I would be happy to assist you today! Here is the link for the Delta faucet warranty. https://www.deltafaucet.com/service-parts/warranty Please contact us back for any further questions. Best Regards, Angel
Answered by: Delta7
Date published: 2024-03-28

Master bath shower head leaks water. Pull Out Handle part Delta 58045B (per HPBD) built 2012. Online search suggests the Cartridge Value is Part RP50587, your site lists as Delta Cartridge Diamond Valve 1H. Is this the correct replacement?

Asked by: Victor
Hi Victor, Thank you for your question about the Delta Faucet RP50587. This cartridge is not used in shower valves. Replacement parts for a drip or leak while off will depend on the model of the shower valve. For a 17 series shower, replace the RP46073 adapter or RP46463 cartridge. For a 14 series shower, replace the RP4993 seats and springs or the RP46074 cartridge. https://support.deltafaucet.com/s/article/RP46463-Shower-Cartridges https://support.deltafaucet.com/s/article/My-1300-1400-Series-Monitor-is-leaking-from-the-shower-head-or-spout-What-do-I-need-1628028367129 Please reach out for further assistance or with any additional questions! Best Regards, Bryan Digital Communications Specialist
Answered by: Delta
Date published: 2025-02-26

Is this part " Cartridge - DIAMOND™ Valve - 1H Model#: RP50587" under warranty. It froze up where almost impossible to turn on?

Asked by: Jaime
Hi Jaime, Thanks for your question regarding RP50587! Our products have a Lifetime Limited Warranty that covers parts and finishes being free of defects in material and workmanship for the original owner/purchaser. Please contact us directly, as we will need to collect more information to further assist you. Thank you for being a loyal Delta Faucet customer! Best Regards, Emma Digital Communications Specialist
Answered by: Customer Service
Date published: 2023-04-07

Isn't this a lifetime warranty item. I replaced the same part several years ago without charge.

Asked by: John Stanley
Hi John Stanley, Thank you for contacting Delta Faucet Company! Yes, we have a Limited Lifetime Warranty for our first consumer purchasers. To learn more about our Warranty, please refer to the link below. https://www.deltafaucet.com/warranty 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: 2024-01-31

is the valve assy warranty

Asked by: Joes
Hi Joes! Thank you for your question! This part would have a lifetime limited warranty to the original purchaser of the product. Best Regards, Tim
Answered by: Delta
Date published: 2024-03-28

Hi,my Delta Bellini single handle kitchen faucet,MODEL11946-SSSD-DST leaks after pushing handle down to the close position.It needs new valve assembly or valve cartridge(part# RP58507)I've read this part has life time warranty.Please send this part. Thnx.

Asked by: KitchenChef
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
Answered by: Delta
Date published: 2025-01-27

What is the orange switch below the handle valve operation on a RP50587 ?

Asked by: mel f
Hi mel! Thank you for your question and we are happy to help. The orange tab on the Delta RP50587 is the is 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. With any further questions or concerns, please do not hesitate to reach out to us again. Best Regards, Carrie
Answered by: Customer Service
Date published: 2024-03-28

Is this cartridge compatible with the Delta 16997 Single Handle Pullout Talbott Faucet?

Asked by: SWEVA13
Hi Valued Customer, Thank you for your question! Yes, the cartridge is compatible with 16997-SD-DST. 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
Answered by: Themar
Date published: 2025-02-04

I have a single handle kitchen faucet. The handle is behind the curved neck of the faucet. It has a slow drip (one or 2 per minute).

Asked by: Gregg
Hi Gregg, Thanks so much for contacting Delta Faucet Company! The RP50587 is for DST faucets, this can be identified by your supply lines. DST are long charcoal gray PEX supplies, if your lines are copper than you would need the RP3614 repair kit. 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: 2024-03-28

My Delta faucet needs a new cartridge, it came with the new house when I moved in 8 years ago,  wondering if it’s under the Delta’s life time warranty?

Asked by: Wkjoe
Thank you for your question, Wkjoe. We are happy to help with any faucet issues. Please contact us directly so we can find any parts your faucet needs. Best regards, Bryan
Answered by: Delta Faucet
Date published: 2024-03-28

I've just replaced my cartridge (rp50587) on my Delta kitchen faucet. The drip is fixed but now I have low water pressure and my boost button does not work. What is going on?

Asked by: Debbie
Hello Debbie, Thank you for contacting Delta Faucet Company! I am sorry this information was not readily available on our Cartridge - DIAMOND™ Valve - 1H MODEL#: RP50587, and I am happy to help you! Low flow is caused by debris, we would recommend flushing the faucet. To flush the unit, we recommend the following: Start with the easy stuff: Remove your aerator, wand or hose to check the flow through the unit without that part installed. If the flow is good, the piece you’ve removed is where the issue is. Soaking the part in a 50/50 mixture of white vinegar and water could help remove any particles or debris blocking the flow. If the water does not have a good flow, the problem could be in the faucet. Next, check the supply lines for debris: Turn the supply off to both the hot and cold-water lines. Once off, turn the handle on the faucet to the on position and leave it there to bleed the lines of any excess water. Next, disconnect the hot water supply line and place it inside a bucket. Once the line is securely positioned into the bucket, turn on the cold-water supply. Thank you for being a loyal Delta Faucet customer. Please contact us back with any further questions. Best Regards, Nicole
Answered by: Delta7
Date published: 2024-03-28

Is it possible to replace parts _inside_ the cartridge? Our cartridge works fine except that a white plastic disk has crumbled where the handle stem makes contact with it. We just need to replace that disk. Is it possible?

Asked by: mfripp
Thank you for your question, mfripp! I do apologize for that issue, but will be more than happy to help! No, the components inside the cartridge can not be replaced. I have sent you an email, so we can further assist you with this matter. Feel free to reply to the email, if you need further assistance. Best Regards, Benjamin
Answered by: Benjamin
Date published: 2024-03-28

Is MODEL#: RP50587 a warranty part

Asked by: Kdub
Hi Kdub, thank you for contacting Delta Faucet Company! To gather warranty information please refer to the link below. https://www.deltafaucet.com/warranty We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Communications Specialist
Answered by: Customer Service
Date published: 2024-03-28

I have a Lahara bathroom sink faucet that is leaking at the faucet spout. It was installed when my house was built in 2015-16. I think the cartridge needs to be replaced. Is this part under warranty?

Asked by: Peg K
Hello! Thank you for contacting Delta Faucet Company! We apologize for the issues you are experiencing and we are happy to help! Our warranty covers parts, finishes, and manufacturing defects for our first consumer purchasers. https://www.deltafaucet.com/warranty We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Communications Specialist
Answered by: Delta
Date published: 2026-01-09

I need a replacement cartridge for my kitchen sink faucet

Asked by: John
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 (800) 345-3358 customerservice@deltafaucet.com
Answered by: Themar
Date published: 2025-03-04

Will this part work for the model 470-DST?

Asked by: Nick
Hello Anonymous, Thank you for contacting us, I would be happy to help you. Our Delta model 470-DST does take the RP50587, please see the link below for the parts diagram. https://media.deltafaucet.com/PartsDiagram/DPD-K-470-DST_A.pdf Please contact us back if you have any questions or need further assistance.  Best Regards,  Nicole
Answered by: Delta7
Date published: 2024-03-28
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