By Caleb MorganUpdated November 2026
A delta faucet valve cartridge is the part that controls water flow and temperature inside a single-handle faucet, and when it wears out, the usual symptoms are drips, sputtering, or a handle that feels loose or hard to move. The Delta Faucet RP50587 is a replacement cartridge in chrome, labeled as the small size, built for owners who want to restore an existing Delta single-handle faucet rather than buy a new fixture. It suits homeowners comfortable with a basic faucet repair and anyone who has already confirmed the old cartridge is the source of the leak. It is a poor choice if you are not sure which Delta model you own, because the cartridge must match the faucet body. Buyers who need a different finish, a tub-and-shower cartridge, or a full faucet replacement should look elsewhere.
Delta Faucet RP50587 Single Handle Valve Cartridge,Chrome,Small
Product Overview
The RP50587 is a single-handle valve cartridge sold under Delta’s replacement parts line. Its listing identifies it as a chrome finish in the small size, which points to a specific group of Delta single-handle faucets rather than a universal fit. Delta cartridges are designed as a sealed unit that slides into the faucet body, so replacing one usually means swapping the whole assembly instead of individual seals or O-rings. That makes the job faster for most people, but it also means the part number has to match closely.
Before buying, it helps to understand where this part fits in the faucet. The cartridge sits under the handle and mixes hot and cold supply, then directs the blend through the spout. If you are new to this kind of repair, the step-by-step process is covered in How to Replace a Delta Kitchen Faucet Cartridge in 6 Steps (2026), which walks through shutting off supply, removing the handle, and extracting the old part.
Key Features & Specifications
| Specification | Detail |
|---|---|
| Product type | Single-handle valve cartridge |
| Manufacturer | Delta Faucet |
| Model number | RP50587 |
| Finish | Chrome |
| Size designation | Small |
| Function | Controls hot and cold water mixing and flow |
| Installation | Replaces an existing cartridge in a compatible Delta faucet |
Beyond the listed name and finish, detailed dimensions and the full list of compatible faucet models should be confirmed against the packaging or Delta’s parts documentation. Specific flow rates and pressure ratings are not stated in the listing summary, so this review does not assume them.
Pros & Cons
Pros
- Restores a single-handle Delta faucet without replacing the entire fixture.
- Chrome finish is designed to match common chrome faucet bodies.
- A cartridge swap is generally quicker than tracking down individual internal seals.
- Delta is a widely distributed brand, so replacement guidance is easy to find.
- Clearly labeled part number makes it easier to cross-check against an old cartridge.
Cons
- Compatibility depends on matching the specific faucet model, which can be tricky to confirm.
- Not suitable for tub-and-shower or other non-kitchen valve types.
- Owners sometimes report that an incorrect size leads to leaks even after installation.
- Does not solve problems caused by a worn spout, aerator, or supply line.
- Installation still requires shutting off water and working under a sink.
Performance Analysis
A cartridge’s performance is mostly a function of fit and internal sealing. Because the RP50587 is a sealed unit, the most common performance issues people report are not about the cartridge itself but about installation: failing to fully seat the cartridge, reusing a worn O-ring or retaining clip, or pairing it with a faucet body that is slightly different from the original. When installed correctly on a matching faucet, a new cartridge typically eliminates drips caused by the old unit’s worn seals and restores smooth handle action.
Owners often report that the handle feels stiffer after installation if the cartridge is not lubricated or if mineral deposits remain in the valve body. Manufacturers generally recommend cleaning the cavity and applying a silicone-based lubricant designed for faucet components before seating the new unit. Skipping that step is a frequent cause of early complaints.
Water pressure and temperature control depend on the rest of the system too. If your water heater is set very high or your supply pressure is unusually low, a new cartridge will not change those conditions. For diagnosing low flow after a repair, Delta Tub Faucet Diverter Review: Features and Performance is a useful comparison, since diverter and cartridge problems can produce similar symptoms.
Who Should Buy This Product?
This cartridge is a good fit for homeowners who already own a Delta single-handle faucet in chrome and have confirmed the existing cartridge is worn. It is also suitable for anyone who wants a like-for-like replacement rather than a new fixture. Renters and first-time DIY repairers can handle this job with basic tools, provided they photograph the old cartridge and its orientation before removing it.
Skip this product if your faucet is a different brand, a different Delta line that uses another cartridge, or a tub-and-shower valve. If you are unsure whether your faucet is compatible, a plumber can confirm the match in a short visit, which is a sensible step if the wrong part would mean more trips to the store.
Buying Guide
Start by identifying your faucet model. Delta typically prints a model number on the handle, under the cap, or on the packaging of the original faucet. Compare your old cartridge against the part number and size designation in the listing before you order. If the old cartridge is still in your hands, bring it to a hardware store for a visual match.
Next, decide whether you need the same finish. Chrome is common, but some Delta faucets come in brushed nickel, bronze, or other finishes, and the cartridge itself may need to match the faucet family. If you want a different look, consider a complete faucet upgrade instead.
Finally, consider alternatives. Two well-known options are the Delta Faucet RP46074 tub and shower cartridge for bathroom valves, which serves a different application entirely, and a third-party replacement cartridge labeled as fitting the RP50587 for kitchen and lavatory use.
- Delta Faucet RP46074 Tub Shower Cartridge, 1, White: Designed for tub and shower valves rather than kitchen faucets. Choose this only if your fixture is a bath or shower valve.
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Delta Faucet RP46074 TUB SHOWER CARTRIDGE, 1, White
- View on Amazon
- 1-Pack Replacement Faucet Cartridge for Delta RP50587 DST: A third-party option labeled as fitting the RP50587 family for leak, drip, and squeak repairs. Verify the listed compatibility before buying.
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1-Pack, Fits Delta Diamond Kitchen Lavatory Valve Single Handle, Fix Leak or Drip, Squeak, Tempe Issues, Include Handle Limit Faucet Cartridge Replacement for Delta RP50587 DST
- View on Amazon
FAQ
How do I know if I need a delta faucet valve cartridge?
Common signs include a faucet that drips after being turned off, a handle that is hard to move or feels loose, and temperature that changes unexpectedly. Check for leaks at the base of the spout first, since other parts can cause similar symptoms.
Can I replace the cartridge without shutting off the water?
No. Shut off both the hot and cold supply valves under the sink, then open the faucet to relieve remaining pressure before removing the cartridge. Skipping this step can cause a spray of water.
Do I need a special tool to remove a Delta cartridge?
Many Delta cartridges can be removed by hand or with pliers after the handle, cap, and retaining clip are off. Some owners use a cartridge puller for stubborn parts, but a puller is not always necessary.
Why does my faucet still drip after replacing the cartridge?
The most common causes are an incorrect cartridge size, a cartridge that did not seat fully, or debris left in the valve body. Other possibilities include a worn spout, a damaged O-ring, or a faulty aerator.
Is a chrome cartridge the same as a brushed nickel one?
The finish refers to the cartridge’s exterior appearance and does not change its internal function, but it should match the faucet family for a clean fit. Check the part number rather than relying on finish alone.
How long does a faucet cartridge usually last?
Lifespan varies with water quality, usage, and maintenance. Owners often report replacing cartridges after several years, especially in areas with hard water or sediment.
Should I hire a plumber for this repair?
Many homeowners complete a cartridge swap themselves, but if you are uncertain about shutoff valves, compatibility, or water damage risks, consult a licensed plumber. This is a sensible precaution for older plumbing.
Where can I learn more about other cartridge types?
For other brands, see Moen Faucet Valve Cartridge: Step-by-Step Replacement Guide (2026), and for general repair steps, Replace Kitchen Faucet Cartridge: Step-by-Step Repair Guide.
Final Verdict
The Delta Faucet RP50587 is a sensible choice for owners of compatible chrome Delta single-handle faucets who have confirmed their existing cartridge is worn. Its main strength is that it restores function without requiring a new faucet, and its main limitation is that compatibility must be checked carefully before purchase. If your faucet matches the listing, this is a straightforward replacement; if not, a different part or a professional consultation is the better route.
About Caleb Morgan
Caleb Morgan is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.
