By Miles SinclairUpdated November 2026
Finding the right delta replacement parts kitchen faucet component can save a working faucet from the trash bin, but only if the part matches your model. Delta has used several cartridge designs over the years, and a leak or stiff handle usually traces back to one specific worn piece. This guide compares six replacement options by fit, documented specifications, brand reputation and the patterns owners commonly describe, so you can narrow down the part you actually need before you open the faucet.
Our top picks at a glance
- 1
TOP CHOICEBest overallDanco Cartridge Repair Kit for Delta Single-Handle Faucet (86970)View on Amazon - 2
TOP CHOICEBest for Delta RP50587 valvesDelta Faucet RP50587 Single Handle Valve CartridgeView on Amazon - 3
TOP CHOICEBest for a complete hardware refreshDELTA FAUCET RP73000 Delta Plumbing Replacement PartsView on Amazon - 4
Best for two-handle faucets2-Pack Delta RP25513 Faucet Cartridge ReplacementView on Amazon - 5
Best budget pickFits Delta Diamond Kitchen Lavatory Valve Single Handle, 1-PackView on Amazon - 6
Best for Diamond Seal modelsRP50587 Cartridge Replacement for Delta Single Handle Kitchen FaucetsView on Amazon
Our selection criteria were straightforward. We favored parts with clearly stated Delta compatibility, a named model or part number, and a scope that matches a common repair. We also weighed how well each listing describes what is included, since a missing bonnet nut or seat can turn a simple repair into a second trip.
Our Top Picks
| Product | Best for | Key feature |
|---|---|---|
| Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970) | Single-handle leaks and drips | Brass cartridge repair kit with multiple component types |
| Delta Faucet RP50587 Single Handle Valve Cartridge | Direct OEM-style cartridge swap | Compact valve cartridge matched to RP50587 reference |
| DELTA FAUCET RP73000 Delta Plumbing Replacement Parts | Broader Delta part replacement | Genuine Delta part number for a specific subassembly |
| 2-Pack Delta RP25513 Faucet Cartridge Replacement | Two-handle faucets | Two cartridges plus stem, seat and spring components |
| Fits Delta Diamond Kitchen Lavatory Valve Single Handle, 1-Pack | Budget single-handle repair | Includes a handle limit stop feature |
| RP50587 Cartridge Replacement for Delta Single Handle Kitchen Faucets | Diamond Seal Technology models | Includes RP51503 bonnet nut for a complete swap |
Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970)
Faucet Repair Kits, Cartridge Repair Kits, Faucet Cartridges, Single Handle Faucets, Brass/Plastic/Rubber/Steel Danco Cartridge Repair Kit for Delta Single-Handle Faucet, Brass (86970)
Best for: Single-handle leaks and drips
This kit suits homeowners who want to diagnose a single-handle leak by replacing the internal wear points rather than the whole valve. It is a good first step when the faucet drips from the spout after the handle is closed.
Key specs
- Brass repair kit designed for Delta single-handle faucets
- Listed as Danco model 86970
- Includes multiple component types (brass, plastic, rubber and steel parts)
Pros
- Addresses several common wear points in one purchase
- Danco is a long-established name in faucet repair parts
- Useful for owners who want to inspect and replace individual components
Cons
- Requires careful matching of components to your Delta model
- Fitting multiple small parts can be fiddly for first-time repairers
Bottom line: Best for owners with a single-handle Delta leak who want a versatile kit and are comfortable confirming part compatibility before installation.
Delta Faucet RP50587 Single Handle Valve Cartridge
Delta Faucet RP50587 Single Handle Valve Cartridge,Chrome,Small
Best for: Direct OEM-style cartridge swap
This is aimed at owners who have already identified the RP50587 reference, usually printed on the old cartridge or in the Delta manual, and want a direct replacement.
Key specs
- Delta part reference RP50587
- Single-handle valve cartridge in chrome
- Compact size suited to standard single-handle kitchen bodies
Pros
- Uses the exact Delta part reference, which simplifies matching
- Single-cartridge swap keeps the repair relatively quick
- Chrome finish matches most Delta kitchen faucets
Cons
- Does not include a bonnet nut, so check the old one before ordering
- Only relevant if your faucet uses this specific cartridge
Bottom line: Ideal if you have confirmed the RP50587 reference and want a straightforward cartridge replacement.
DELTA FAUCET RP73000 Delta Plumbing Replacement Parts
DELTA FAUCET RP73000 Delta Plumbing Replacement Parts, Chrome
Best for: Broader Delta part replacement
This suits owners who have identified a worn Delta component by part number and want an official Delta part rather than a generic substitute.
Key specs
- Delta part number RP73000
- Chrome finish
- Designed as a replacement component for Delta plumbing fixtures
Pros
- Genuine Delta part number reduces compatibility guesswork
- Chrome finish blends with most Delta hardware
- Useful when a single subassembly has failed
Cons
- Its scope is narrower than a full repair kit
- Owners must confirm the RP73000 reference matches their faucet before buying
Bottom line: Best for owners who have pinpointed one failed component by Delta part number and want an OEM-referenced replacement.
2-Pack Delta RP25513 Faucet Cartridge Replacement
2-Pack for Delta RP25513 Faucet Cartridge Replacement: 2-Handle Faucet Repair Kit for Delta Bathroom Kitchen Faucets Stem Parts Replacement with RP24096, RP4993 Seats & Springs, RP24097 1/4 Turn Stop
Best for: Two-handle faucets
Two-handle Delta faucets rely on separate hot and cold stems, so this two-pack format is useful when both sides show wear or when you want a spare on hand.
Key specs
- Two-pack of RP25513 cartridges
- Listing includes RP24096 and RP24097 related components and RP4993 seats and springs
- Designed for Delta bathroom and kitchen two-handle faucets
Pros
- Covers both hot and cold sides in one order
- Includes seats, springs and stop components listed by reference
- Useful for keeping a spare cartridge
Cons
- Only useful for two-handle designs, not single-handle faucets
- Listing bundles several reference numbers, so verify each against your old parts
Bottom line: Best for two-handle Delta owners who want matched hot and cold replacements with supporting components.
Fits Delta Diamond Kitchen Lavatory Valve Single Handle, 1-Pack
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
Best for: Budget single-handle repair
This is a practical choice for owners of Diamond-style single-handle Delta faucets who want a single cartridge without paying for a larger kit.
Key specs
- Single-cartridge, 1-pack format
- Listing references Delta RP50587 compatibility
- Includes a handle limit faucet cartridge feature
Pros
- Simple one-cartridge purchase for a targeted fix
- Handle limit feature helps owners who want to control maximum flow
- Covers common issues like drips and stiff handles
Cons
- Third-party part, so cross-check dimensions against the original
- Does not include a bonnet nut or seals
Bottom line: A sensible budget pick for owners who know they need one cartridge and want to keep the job simple.
RP50587 Cartridge Replacement for Delta Single Handle Kitchen Faucets
RP50587 Cartridge Replacement for Delta Single Handle Kitchen and Lavatory Faucets, Works with DIAMOND Seal Technology Models Featuring a 36 mm Motion, (Include RP51503 Bonnet Nut）
Best for: Diamond Seal Technology models
This option is built for owners of Delta models using Diamond Seal Technology, and it bundles the bonnet nut, which can otherwise be hard to source separately.
Key specs
- Designed for RP50587 cartridge applications
- Works with Diamond Seal Technology models
- Listing references a 36 mm motion and includes RP51503 bonnet nut
Pros
- Includes the bonnet nut, making it a more complete swap
- Explicitly lists Diamond Seal compatibility
- Covers both kitchen and lavatory single-handle faucets
Cons
- Compatibility depends on confirming the Diamond Seal design in your faucet
- Fit details like the 36 mm motion should be checked against your old cartridge
Bottom line: Best for owners who have verified a Diamond Seal Delta faucet and want a cartridge that comes with the bonnet nut.
Buying Guide
Identify your faucet model and part reference
Before comparing parts, locate the model number, usually stamped under the faucet, on the base of the spout, or in the original Delta documentation. Many cartridge failures are tied to a specific reference such as RP50587, and matching that reference eliminates most guesswork.
Good picks for this: Delta Faucet RP50587 Single Handle Valve Cartridge, DELTA FAUCET RP73000 Delta Plumbing Replacement Parts
Single-handle versus two-handle designs
Single-handle faucets use one cartridge to control both temperature and flow, while two-handle designs use separate hot and cold stems. Buying the wrong configuration is one of the most common reasons a replacement fails to seal, so confirm which type you have before ordering.
Good picks for this: 2-Pack Delta RP25513 Faucet Cartridge Replacement, Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970)
Completeness of the kit
Check whether a listing includes the bonnet nut, seals, springs or seats. A missing bonnet nut is a frequent reason for a delayed repair, so a more complete package can reduce the number of trips to the hardware store.
Good picks for this: RP50587 Cartridge Replacement for Delta Single Handle Kitchen Faucets, Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970)
Finish and visual match
Delta faucets are commonly offered in chrome and other finishes. Replacement cartridges are internal, so finish matters mainly for exposed hardware like handles and escutcheons. Chrome components are the most common match for standard Delta kitchen faucets.
Good picks for this: Delta Faucet RP50587 Single Handle Valve Cartridge, DELTA FAUCET RP73000 Delta Plumbing Replacement Parts
Diagnosing the symptom before buying
A constant drip from the spout usually points to the cartridge or seals, while a stiff or loose handle often indicates a worn stem or spring. Matching the part to the symptom keeps you from replacing a component that was not the problem. If the drip continues after a swap, the issue may be a worn valve seat or a damaged O-ring.
Good picks for this: Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970), Fits Delta Diamond Kitchen Lavatory Valve Single Handle, 1-Pack
Durability and material
Brass bodies and internal components generally resist corrosion better than plastic, but quality varies by manufacturer. Look for listings that specify materials. Note that many cartridges are rated to a set number of cycles in manufacturer documentation, so a replacement is a maintenance item over the life of the faucet.
Good picks for this: Danco Cartridge Repair Kit for Delta Single-Handle Faucet (86970), RP50587 Cartridge Replacement for Delta Single Handle Kitchen Faucets
Care after installation
After replacing a cartridge, run the water for a minute or two to flush debris from the line, and check for leaks at the base and spout. Avoid overtightening the bonnet nut, which can crack plastic components. Periodic cleaning of aerators helps maintain flow and reduces wear on new parts.
Good picks for this: 2-Pack Delta RP25513 Faucet Cartridge Replacement, Delta Faucet RP50587 Single Handle Valve Cartridge
FAQ
What is the most common Delta kitchen faucet part to replace?
The cartridge is the component most often replaced, because it controls water flow and temperature and wears over time. Drips from the spout after the handle is closed are a typical sign that the cartridge or its seals need attention.
How do I find the correct replacement part number for my Delta faucet?
Check the old cartridge for a stamped reference, consult the Delta manual, or contact Delta customer support with your faucet model. Matching the reference exactly is the most reliable way to confirm fit.
Can I use a generic cartridge instead of a Delta-branded part?
Some aftermarket cartridges fit Delta faucets, but compatibility depends on the specific design. Confirm the cartridge reference and dimensions against your original part, and check whether the listing names the Delta model it is intended to replace.
Do I need to replace the bonnet nut when I change the cartridge?
Not always, but it is worth inspecting. If the bonnet nut is corroded, cracked or stripped, replacing it prevents trouble during reassembly. Some kits include one, which can simplify the job.
Is a repair kit better than a single cartridge?
A repair kit is useful if you want to replace several wear points at once, such as seats and springs. A single cartridge is simpler if you have already confirmed that the cartridge is the failed component.
How long should a Delta kitchen faucet cartridge last?
Lifespan depends on water quality, usage and maintenance. Hard water and sediment can shorten cartridge life. Manufacturers generally describe cartridges as wear items, so periodic replacement is normal rather than a sign of a defect.
Should I consult a professional for a faucet repair?
Most cartridge replacements are manageable for homeowners with basic tools, but if you find corroded supply lines, a damaged valve body or water damage under the sink, consult a licensed plumber before proceeding.
Conclusion
For most Delta single-handle leaks, the Danco repair kit offers a versatile starting point, while the Delta RP50587 cartridge suits owners who have already confirmed their reference. Two-handle faucets are better served by the RP25513 two-pack, and owners of Diamond Seal models should look at the RP50587 option that includes the bonnet nut. The budget single-handle cartridge works well for a targeted fix, and the RP73000 part fits owners who have identified one specific component by number. Match the part to your model and symptom first, and the repair is usually straightforward.
Sources
- Guidance on household water use and conservation, useful context for fixture maintenance (epa.gov)
- Consumer product safety information on home repairs and plumbing-related hazards (cpsc.gov)
- Water-efficiency resources for faucets and fixtures (energy.gov)
Related reading
- Delta Bathtub Faucet Replacement Parts: Find and Install the Right Ones
- Delta Bathroom Tub Faucet Parts: 8 Best Replacements Compared
- 7 Best Delta Kitchen Faucet Parts (2026): Repair-Ready Picks
About Miles Sinclair
Miles Sinclair is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.
