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A delta bathtub faucet repair kit is usually the fastest way to stop a dripping tub spout, a shower that runs even when it is off, or a handle that suddenly feels stiff. Most of these problems come from a worn cartridge, a failed valve seat or deteriorated rubber seals, and a correct kit replaces those parts without swapping the entire faucet. The catch is that Delta has used many different valve series over the decades, so a kit that fits one tub can be wrong for another. This guide compares nine kits and explains how to match them to your faucet. The selection criteria were compatibility with common Delta tub and shower valve series, completeness of the parts included, clarity of the manufacturer’s model information, and owner feedback patterns about fit and leak resolution. None of these were installed or tested by our writers; the comparisons draw on manufacturer specifications and commonly reported owner experiences.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Delta RP19804 Tub and Shower Cartridge Kit | Owners of Delta single-handle tub and shower valves | Direct cartridge replacement for a common single-handle tub valve |
| Delta RP45888 Tub and Shower Cartridge | Single-handle tub and shower valves in the Delta 1700 series family | Single-piece cartridge that replaces the entire mixing unit |
| Delta RP46174 Universal Tub and Shower Cartridge | Owners who want one part for a range of Delta single-handle valves | Universal-fit design for multiple Delta bodies |
| Delta RP1028 Cartridge Assembly | Older Delta single-handle tub valves | Long-established part number with broad owner reference |
| Delta RP4992 Tub and Shower Cartridge | Shower-focused valves where the handle controls only mixing | Compact cartridge for shower-only valve bodies |
| Delta RP20021 Two-Handle Cartridge Kit | Two-handle Delta tub valves with separate hot and cold stems | Includes stem and seat components for two-handle service |
| Delta RP19805 Valve Repair Kit | Owners who want seals and seats, not a full cartridge | Rebuild-style kit with O-rings and seat washers |
| Delta RP80903 Stem Repair Kit | Two-handle valves with worn stems and washers | Stem-level parts for low-cost repair of compression-style valves |
| Danco 88862 Universal Tub and Shower Cartridge Kit | Owners who cannot find the exact Delta part number | Third-party cartridge built to match many Delta-style valves |
Delta RP19804 Tub and Shower Cartridge Kit
This is a good starting point for owners with a single-handle Delta tub and shower valve who see water leaking from the spout or shower head even when the handle is off. It is the kind of direct-replacement cartridge most homeowners are looking for when they search for a delta bathtub faucet repair kit.
Key specs
- Single-handle cartridge for Delta tub and shower valves
- Replaces the internal mixing cartridge without removing the valve body
- Designed for Delta’s common single-handle tub and shower configurations
- Manufacturer model number printed on the packaging for matching
Pros
- Addresses the most common cause of tub leaks: a worn cartridge
- Straightforward swap with basic hand tools
- Clearly labeled Delta part number simplifies verification
Cons
- Will not fit older valve bodies from other eras
- Owners often report that the old cartridge must be fully removed first, which can be stiff
Delta RP45888 Tub and Shower Cartridge
Suited to owners whose valve model calls for a single-piece cartridge that houses the full mixing unit. It works well when you want a complete internal replacement rather than piecemeal seal work.
Key specs
- Single-piece cartridge design
- Intended for Delta single-handle tub and shower valves
- Replaces the full internal mixing assembly
- Part number must match the valve body; confirm against the old cartridge
Pros
- One-piece design avoids small-part losses during installation
- Addresses hot and cold mixing as a unit
- Good match for owners who prefer full replacement over rebuilding
Cons
- Costs more in effort to verify fit than a generic seal kit
- Not interchangeable across all Delta valve families
Delta RP46174 Universal Tub and Shower Cartridge
This suits owners who want one replacement part to cover several Delta single-handle valve bodies, especially when the original model is hard to identify. It is a practical option in homes with mixed Delta hardware installed over several renovations.
Key specs
- Universal-fit cartridge for multiple Delta single-handle valves
- Single-handle operation
- Designed to reduce the number of part numbers a homeowner must match
- Check the compatibility list in the listing before ordering
Pros
- Wider compatibility reduces guesswork
- Useful when the valve model is worn off or unknown
- Straightforward cartridge swap
Cons
- Universal designs sometimes need minor adjustment to seat correctly
- Not every Delta valve body is covered, so confirm first
Delta RP1028 Cartridge Assembly
Best for owners with an older single-handle Delta tub valve who need a long-established replacement part. Many repair guides from the past decade reference this part number, which makes cross-checking easier.
Key specs
- Single-handle cartridge assembly for older Delta tub valves
- Long-standing part number widely referenced in repair resources
- Replaces internal mixing parts, not the valve body
- Confirm against the existing cartridge before purchase
Pros
- Well-documented part number
- Good fit for legacy valves still in service
- Simple cartridge replacement procedure
Cons
- Older parts may be less available in some stores
- Newer Delta valve series will not accept it
Delta RP4992 Tub and Shower Cartridge
This is designed for shower-focused valves where the handle controls the mix but the tub spout is separate or absent. It fits homeowners whose main complaint is a shower that drips or changes temperature unexpectedly.
Key specs
- Compact cartridge for shower-only Delta valve bodies
- Controls mixing for the shower outlet
- Intended for shower valves without a separate diverter function
- Verify whether your valve has a diverter before ordering
Pros
- Right size for shower-only valves
- Helps stop temperature drift caused by worn cartridges
- Limited parts needed for a basic swap
Cons
- Will not fix diverter problems on combination valves
- Not suitable for tub-and-shower systems with a separate spout valve
Delta RP20021 Two-Handle Cartridge Kit
Aimed at Delta two-handle tub valves, where hot and cold have separate stems. It suits owners whose handles are stiff, drip at the spout, or need a valve-level refresh rather than a full faucet replacement.
Key specs
- Two-handle service kit with stem and seat components
- Intended for Delta two-handle tub valves
- Includes multiple parts for a more complete rebuild
- Match the kit to your valve series before ordering
Pros
- Addresses hot and cold separately
- Good for stiff or leaking two-handle valves
- More complete than a single seal kit
Cons
- Requires more disassembly than a cartridge swap
- Owners often report needing a second visit to confirm fit
Delta RP19805 Valve Repair Kit
A rebuild-style kit containing O-rings, seat washers and seals rather than a full cartridge. It is suited to owners comfortable with light disassembly who want to replace only the worn rubber parts.
Key specs
- Contains O-rings, seals and seat washers
- Intended for Delta tub valve rebuilds
- Does not include a full cartridge body
- Requires removal of the valve handle and stem
Pros
- Lower-cost route to fixing a worn valve
- Targets the rubber parts that usually fail first
- Keeps the existing valve body in place
Cons
- Requires more hands-on work and careful reassembly
- Does not address a cracked or corroded cartridge body
Delta RP80903 Stem Repair Kit
Useful for two-handle valves where the stem and washer have worn, causing drips at the spout. It suits owners who have already confirmed the valve body is sound and want a targeted fix.
Key specs
- Stem-level repair parts for compression-style valves
- Includes washers and stem components
- Intended for Delta two-handle tub valves
- Verify stem length and thread type before ordering
Pros
- Targeted repair for a common drip source
- Low-complexity parts
- Good for valves with otherwise healthy internals
Cons
- Not useful for cartridge-type valves
- Owners often report that corroded stems can require full replacement
Danco 88862 Universal Tub and Shower Cartridge Kit
A third-party cartridge option for owners who cannot locate the exact Delta part number. It is designed to fit many Delta-style single-handle valves, making it a practical backup choice when the original is discontinued.
Key specs
- Universal cartridge designed for many Delta-style valves
- Single-handle operation
- Third-party replacement, not a Delta-branded part
- Check the listing’s compatibility chart before purchase
Pros
- Helpful when the Delta part is discontinued
- Broad fit across several valve families
- Clear packaging and compatibility information
Cons
- Not an OEM part, so some owners prefer Delta-branded replacements
- Fit can vary slightly on older bodies
Buying Guide
Selection criteria
The right delta bathtub faucet repair kit depends on three things: the valve type (single-handle or two-handle), the valve series, and the failure you are trying to fix. A kit that matches the wrong valve will not seal, and a cartridge installed in a damaged body will leak again. Start with what you can observe: which handle, which outlet, and whether the leak is constant or only when the handle is in a certain position.
Important features
- Valve type. Single-handle tub valves use a cartridge. Two-handle valves usually use stems, washers and seats.
- Completeness. A full cartridge is simpler than a rebuild kit, but a rebuild kit can be cheaper in parts and effort if the body is sound.
- Manufacturer model information. Look for a clear Delta part number and a compatibility list.
- Material. Brass bodies and ceramic-disc cartridges generally resist wear longer than bare plastic components, according to general manufacturer guidance.
Specs to check
- Delta model number stamped on the valve or printed on the old cartridge
- Valve type: single-handle, two-handle, or shower-only
- Number of outlets (tub spout, shower, diverter)
- Stem or cartridge length and thread type if you are rebuilding
Choosing by need
- Single-handle tub with leaking spout: start with a cartridge kit such as the Delta RP19804 or RP45888.
- Single-handle shower-only valve: the Delta RP4992 is sized for this layout.
- Two-handle with spout drip: the Delta RP80903 stem kit or RP20021 two-handle kit.
- Unknown model or discontinued part: the Delta RP46174 universal or Danco 88862 may cover more valve bodies.
Things to watch out for
- Turning off the water supply before removing the handle. Shut off at the main or the local valves.
- Forcing a cartridge out without removing the retaining clip or nut first, which can damage the valve body.
- Assuming a kit fits because the handle looks the same. Delta has changed internal designs over time.
- Ignoring corrosion inside the valve body. If the body is cracked or heavily pitted, a kit will not stop the leak.
For a broader look at how faucet parts are identified, see Delta Kitchen Faucet Parts: Repair-Ready Picks and Moen Kitchen Faucet Parts Diagram: How to Find and Use Yours. Owners of two-handle valves may also find Two-Handle Kitchen Faucets: Layout, Holes and Upkeep useful for understanding stem and seat behavior, though the principles overlap with tub valves. For general cleaning and leak diagnosis, Kitchen Faucet Maintenance: Cleaning, Leaks and Aerators covers the basics.
FAQ
How do I know which delta bathtub faucet repair kit I need?
Identify the valve type first. If there is one handle controlling both temperature and flow, you likely need a cartridge. If there are two handles, you likely need a stem or rebuild kit. Then find the Delta model number, usually stamped on the valve body or printed on the old cartridge. Match that number to the kit’s compatibility list.
Can I replace a cartridge without removing the whole faucet?
In most tub and shower valves, yes. You typically remove the handle, the trim plate and the retaining clip or nut, then pull the cartridge out of the valve body. The valve body itself stays in the wall, which is why cartridge kits are the common choice for tub leaks.
Why does my Delta tub faucet still drip after replacing the cartridge?
The most common causes are a cartridge that is not fully seated, a valve body with corrosion or debris, or a kit that does not match the valve series. Turn the water back on slowly, check that the cartridge is aligned with the index marks, and confirm the part number. If the drip continues, the valve body or seat may need attention.
Do I need plumbing experience to install a repair kit?
Many homeowners complete a cartridge swap with basic hand tools, but valves can be stiff or corroded. If the valve is hard to access, leaks into the wall, or you are unsure how to shut off the water correctly, consult a licensed plumber.
Is a universal cartridge as good as a Delta part?
A universal cartridge can work well when it is listed as compatible with your valve, but it is not made by Delta. Some owners prefer an OEM Delta part to avoid minor fit differences. If you choose a universal, check the compatibility chart carefully and keep your old cartridge until the new one is confirmed to seal.
How long do tub faucet cartridges usually last?
Lifespan depends on water quality, hardness and how often the valve is used. Owners commonly report that cartridges last several years before leaking, but hard water can shorten that. Manufacturers generally recommend inspecting the valve if you notice drips, temperature changes or stiff handles.
What if I cannot find the Delta model number?
Remove the handle and look inside the valve body, or take the old cartridge to a supply store for comparison. You can also photograph the cartridge and compare it against a diagram or parts list. If the valve is very old, a universal kit may be the practical route.
Conclusion
For most single-handle Delta tub leaks, a cartridge kit is the right place to start, and the Delta RP19804 or RP45888 are reasonable matches depending on your valve. Shower-only valves point toward the Delta RP4992, while two-handle drips usually call for the Delta RP80903 stem kit or RP20021 two-handle kit. If you cannot identify the model, the Delta RP46174 universal or Danco 88862 may cover more bodies. Whichever you choose, confirm the part number against your valve first, shut off the water, and inspect the valve body for corrosion before you assume the kit will solve the problem.
