Cartridge - DIAMOND Valve - 1H


Model#: RP50587
RP50587 is rated 4.0 out of 5 by 53.
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Finish: Not Applicable
List Price (US $): $49.75


Product Support, Repair Parts & Technical Specifications

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Installation Information

  • Valve Type: Ceramic valve
Rated 1 out of 5 by from The RP50587 is a terrible product I recently purchased this product because my two year old faucet began dripping and there was no way to stop it. My contractor reoiled the ring and it worked for a month. My replacement lasted less than 6 months and is now leaking again. If it fails so often, as other reviews indicate, why not supply the rubber ring as it likely is the problem...or is it? Time to replace with a different manufacturers product!
Date published: 2018-07-11
Rated 5 out of 5 by from worked great as advertised
Date published: 2018-06-09
Rated 2 out of 5 by from Beautiful Gaucet, but hard to shut off I’ve had this faucet less than a year and the cartridge has malfunctioned. It now leaks and is almost impossible to turn off. The price of a new cartridge is almost half the price of the faucet. We chose this faucet because of the quality behind the Delta brand. I expected better.
Date published: 2018-04-14
Rated 2 out of 5 by from DIAMOND Valve is the WORST! I have owned a number of Delta products and have been very satisfied. In fact I have a bath faucet I installed 33 years ago and it is still working great. HOWEVER, I bought this kitchen faucet 4+ years ago and from day 1 have had mixing issues. One would expect a straight up movement would give a mix of hot and cold but very hot is more the norm. A slight adjustment to the right produces cold, not lukewarm. A slight adjustment to the left produces very hot water. The more the valve is opened the cooler or less hot the water is. Also, as of late, the faucet is dripping and it cannot be fixed simply by running hot water (to expand gaskets). Love the design, but am considering replacing to keep my wife from constantly complaining. If the dripping issue has a fix I would love to know what it is. As for the temperature issue, I'm not sure there is a fix as I believe it is the design of the valve causing the problem but willing to listen to any ideas.
Date published: 2018-04-09
Rated 4 out of 5 by from nice looking faucet Bought this faucet a few years ago , mainly because it is a Delta and the fact it looks good. Overall we have been pretty happy with it. Only problem is after a couple of years the cartridge starts not wanting to shut off. We are on our third cartridge, luckily they are easy to change. Were going to buy a different brand this time but nothing looks as good as this in our bath .
Date published: 2018-03-31
Rated 5 out of 5 by from Repair (replacement) was a breeze! This was so fast and easy my wife said are you done already? Recommend you do it when your spouse is out of the house so you can act like you spent all day on it!
Date published: 2018-03-26
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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 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: 2018-08-11

The red mix lever in the RP50587 cartridge in our faucet (less than 3 years old) will not stay in the mid position (equal hot and cold) but slides to the less volume full on hot position by itself. Do I have to replace the cartridge to fix?

Asked by: Kent
Hello Kent, Thank you for your question! The orange tab on the RP50587 valve assembly is the handle limit stop. The stop limits the handle motion to the hot water side. It only has two positions, it is not designed to be in between (middle) of the two positions. The cartridge comes in the full range setting from the factory. This information can be found on the installation guide that comes with the faucet that includes this cartridge. Best regards, Tanya
Answered by: Delta Faucet
Date published: 2018-07-16

Should I be worry about Proposition 65? Does this product (RP50587) contain any chemical which cause cancer?

Asked by: Dddd
Hi, Dddd! Thank you for your question. The label indicates that components inside the product contain exposed brass, which includes small but detectible amounts of lead—an element on the Prop 65 chemical list. Many products sold in California are required to carry this label. Even though a product may be found to contain a Proposition 65-listed chemical, it does not mean that use of the product will cause cancer, birth defects or other reproductive harm. Nor does it mean that a product is unsafe. All Delta Faucet Company products meet or exceed the requirements of applicable product performance and safety industry standards, as well as the federal Safe Drinking Water Act. We are confident there is no health hazard associated with the installation or removal of our products. Best Regards, Rosanna
Answered by: DeltaFaucet11
Date published: 2018-06-02

I have a model 4353-DST faucet. I need to replace the cartridge (RP50587). When I remove the handle, I am unable to remove the cap (RP51502) from the bonnet (RP51503). Do I have to replace the cap and bonnet?

Asked by: OCmjt00
Hi, OCmjt00. Thank you for your question. I am sorry to hear that you are experiencing an issue with your Delta faucet. We would recommend to replace the cap and bonnet assembly if they cannot be unscrewed from each other. For assistance with this, please contact our Delta Customer Service line at (800)345-3358. We are available Monday-Friday, 7am-7pm, CST and Saturday, 8am-5pm, CST. You may also email at Best Regards, Rosanna
Answered by: DeltaFaucet11
Date published: 2018-06-01

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

Where can I find an illustration of the breakdown of the cartridge RP50587 assembly?

Asked by: Jack
Hi, Jack! Thank you for your question. Unfortunately, we do not have a break down of the cartridge as the cartridge itself should not be broken down. If the valve cartridge assembly is in pieces, we recommend to replace the whole part. Best Regards, Rosanna
Answered by: DeltaFaucet11
Date published: 2018-05-10

I have faucet 19949-RBSD-DST and it's dripping. Do I need to replace valve assy RP50587?

Asked by: TomB
Hi, TomB! Thank you for your question, and I am sorry to hear that you are experiencing a leak from your Delta faucet. There is a bonnet nut that is holding the cartridge down, underneath your handle. We recommend to tighten the bonnet nut to stop the leak. To do this, turn the water off at your shut off valve. Remove the handle. Tighten the bonnet by turning clockwise, to the right. Install the handle back on and turn the water back on. Test the faucet. If the faucet still leaks, we recommend to replace both the valve cartridge assembly, RP50587, and the bonnet nut, RP51503. Best Regards, Rosanna
Answered by: DeltaFaucet11
Date published: 2018-04-18

Delta 955 faucet with Cartridge - DIAMOND™ Valve - 1H Model#: RP50587. Cold water - good, the hot water - very slow. Have isolated problem to water line from valve to house hot water line. Is this water line removable from valve? Thanks

Asked by: TSLove
Hi, TSLove! Thank you for your question, and I am sorry to hear that you are experiencing low flow. Over time, common water debris will settle in the house supply lines. Anytime the water is shut off to a portion of the home, this debris can become dislodged and will move through the pipes to be caught by a faucet. Local construction or the changing of the seasons can also cause this. Flushing the supply lines through the unit should remedy this situation. 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 of a bucket. Once the line is securely positioned into the bucket, turn on the cold-water supply. Since the handle was left in the on position, the water will flow up the cold supply line, through the faucet cartridge and back down the hot water line into the bucket. Leave this flowing for at least 30 seconds. After flushing, reconnect the hot water line and repeat this process with the cold-water line to ensure all particles have been removed from both supplies. If you need further help with this process, please contact us directly and we can walk you through the procedure. We are available at 800-345-3358 (prompt 2, then 3), Monday through Friday, 8am to 8pm and Saturday, 9am to 6pm CST. Best Regards, Rosanna
Answered by: DeltaFaucet11
Date published: 2018-03-22
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