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If your Delta bathroom faucet drips, sputters or suddenly runs hot and cold in the wrong places, the delta bath faucet cartridge is usually the first part to check. Finding the right replacement comes down to four things: the exact Delta series, the handle type (single or double), the cartridge’s internal design, and whether the stem height and connection match what you already have. This guide walks through six well-regarded cartridge options and explains how to choose among them without guessing.
Our selection criteria were based on specifications published by the manufacturer, how well each cartridge matches common Delta bath series, the reputation of the part’s design, and patterns that owners often report in repair discussions. We did not test these parts ourselves. Treat the model fit notes as a starting point and confirm the part number against your faucet before ordering.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Delta RP19803 Single Handle Cartridge | Single-handle Delta bath faucets with a standard shower-style valve | Ceramic disc design for smooth, drip-resistant control |
| Delta RP46320 Cartridge Assembly | Owners replacing a worn single-handle bath cartridge on a Delta faucet of similar vintage | Direct OEM-style replacement with matching handle travel |
| Delta RP50256 Faucet Cartridge | Two-handle bath faucets that need a hot or cold valve replacement | Compression-style operation for two-handle layouts |
| Delta RP20893 Cartridge Kit | Repairs where a complete valve kit is preferred over a single part | Includes seals and retaining hardware for a fuller rebuild |
| Delta RP36181 Single Handle Cartridge | Budget-minded repairs on common single-handle bath models | Simple, widely stocked design with easy removal |
| Delta RP1005 Ceramic Cartridge | Owners who want longer expected service life from a ceramic valve | Ceramic disc construction for consistent flow control |
Delta RP19803 Single Handle Cartridge
This is a good fit for homeowners with a single-handle Delta bath faucet who want a direct replacement for a cartridge that has started to leak around the spout or handle. It suits people who are comfortable turning off the water supply and removing a retaining clip or nut.
Key specs
- Single-handle cartridge for Delta bathroom faucet valves
- Ceramic disc operation for controlled mixing
- Designed to replace the existing valve body insert, not the faucet body
Pros
- Restores smooth handle action when the old cartridge has become stiff
- Ceramic discs are generally more resistant to wear than rubber-based designs
- Installation is usually a single-part swap
Cons
- Fit depends on matching the exact Delta series, so verification is required
- Does not address worn O-rings or seats elsewhere in the valve
Delta RP46320 Cartridge Assembly
Best for owners who want a near-original replacement for a single-handle Delta bath faucet and who plan to compare the old cartridge’s markings and height before buying. It is a practical choice when the faucet is still otherwise sound.
Key specs
- Complete cartridge assembly for select Delta single-handle bath faucets
- Designed to match the original handle travel and temperature range
- Installed by removing the handle, escutcheon and retaining nut
Pros
- Matches factory operation more closely than generic substitutes
- Pre-assembled, so there are fewer loose internal parts to misplace
- Helpful when restoring original handle feel
Cons
- Compatibility is limited to specific model families
- Requires careful alignment of the cartridge stem with the handle
Delta RP50256 Faucet Cartridge
This option is aimed at two-handle Delta bath faucets, where one side has begun to drip or where hot and cold water mix poorly. Owners with older two-handle units often find this type a better match than a single-handle part.
Key specs
- Cartridge designed for two-handle Delta bath valve positions
- Controls flow for one side of the faucet (hot or cold)
- Requires matching the handle position and stem length
Pros
- Lets you replace only the failing side instead of both
- Restores proper shutoff on a dripping two-handle valve
- Commonly referenced in Delta repair guides for two-handle bath faucets
Cons
- Easy to order the wrong hand (hot vs. cold), so confirm the orientation
- Older two-handle designs may need additional seats or washers
Delta RP20893 Cartridge Kit
A kit suits people who want to rebuild the valve rather than swap a single part, especially when the cartridge is wearing along with its seals. It is a sensible choice if you prefer to replace the internal hardware in one purchase.
Key specs
- Kit format that includes cartridge and related seal hardware
- Intended for Delta bath valve repairs on compatible models
- Installation uses standard hand tools and a repair sequence
Pros
- Addresses the cartridge and seals together
- Reduces the chance of a second repair after installation
- Useful when the exact cause of a leak is uncertain
Cons
- Larger than a single-part replacement, which may be unnecessary for minor wear
- Still requires confirming the model match before use
Delta RP36181 Single Handle Cartridge
This is a practical pick for homeowners making a straightforward repair on a common single-handle bath faucet. It appeals to people who want a simple part and are fine handling basic plumbing tasks.
Key specs
- Single-handle cartridge for Delta bath faucets
- Standard removal with a retaining clip or nut
- Intended as a direct replacement, not a valve body upgrade
Pros
- Straightforward design that is easy to identify and remove
- Often a sensible first step before buying a full faucet
- Widely referenced for single-handle Delta bath repairs
Cons
- Not every Delta series uses the same cartridge height or seal pattern
- Plastic components may show wear sooner than full ceramic designs
Delta RP1005 Ceramic Cartridge
Best for owners who want a ceramic-disc valve for longer service life and steadier flow control. It is a reasonable choice for people replacing a cartridge that has started to feel gritty or inconsistent.
Key specs
- Ceramic disc cartridge for compatible Delta bath valves
- Provides controlled temperature mixing through the handle
- Requires confirming stem size and handle compatibility
Pros
- Ceramic discs are commonly associated with smooth, long-lasting operation
- Reduces the drip-prone wear seen in older rubber-seated valves
- Consistent handle feel after installation
Cons
- Ceramic cartridges can be sensitive to debris if the supply lines are not flushed
- Price-to-benefit depends on whether your faucet will stay in service long enough to justify it
Buying Guide
Choosing a delta bath faucet cartridge is mostly a matching exercise. The part has to fit the valve body, the handle has to operate correctly, and the water has to shut off fully. Start with the faucet itself before you look at product listings.
Selection criteria
- Handle type: single-handle and two-handle Delta faucets use different cartridges.
- Series and model: Delta has used many valve designs over the years. The series name or model number is the most reliable identifier.
- Internal design: ceramic-disc and compression-style cartridges behave differently and are not interchangeable.
- Completeness: decide whether you need only the cartridge or a kit with seals.
Important features
Look for a cartridge that matches the original stem height, handle engagement and temperature limit stop. A mismatched stem may let the handle sit at an odd angle or prevent full shutoff. Check whether the cartridge includes a retaining clip or nut, because many Delta designs need these to hold the part in place.
Specs to check
- Delta series name or model number printed on the faucet body or in the original packaging
- Single or double handle
- Cartridge height and stem diameter
- Hot and cold orientation for two-handle units
- Presence of a retaining clip, nut or index cap
Choosing by need
- Single leak at the spout on a single-handle faucet: start with a direct single-handle cartridge.
- Stiff or gritty handle: consider a ceramic cartridge or a kit that includes seals.
- Dripping on one side of a two-handle faucet: replace only the failing side’s cartridge after confirming orientation.
- Uncertain cause: a kit may save time if you do not want a second repair trip.
Things to watch out for
- Ordering by faucet name alone when the valve series differs
- Reinstalling a cartridge without fully seating the retaining clip
- Forgetting to shut off the water supply and open the faucet to relieve pressure
- Assuming a new cartridge will fix a leak caused by a worn seat or O-ring elsewhere
For step-by-step help on reading part numbers and locating the right cartridge, see Moen Kitchen Faucet Parts Diagram: How to Find and Use Yours for a general approach that also applies to Delta valves, and Kitchen Faucet Maintenance: Cleaning, Leaks and Aerators for routine care that can extend a cartridge’s life.
FAQ
How do I know which delta bath faucet cartridge I need?
Identify the faucet series or model number, usually printed on the spout base, the handle or the original box. Count the handles and note whether the faucet is single or two-handle. Then compare the old cartridge’s height and stem size with the replacement listing before buying.
Can I replace a Delta cartridge without removing the whole faucet?
In many bathroom faucets, yes. You typically remove the handle screw, handle cap, escutcheon and retaining nut to reach the cartridge. Shut off the water supply first and open the faucet to relieve pressure.
Why does my Delta faucet still drip after a new cartridge?
The cartridge may not be seated correctly, or a seat, O-ring or spring elsewhere in the valve may be worn. Check that the retaining clip is fully engaged and that the cartridge’s index tab aligns with the valve body.
Is a ceramic cartridge better than a standard one?
Ceramic-disc cartridges are generally associated with smoother operation and longer wear life than older rubber-seated designs. The better choice still depends on compatibility with your specific Delta series.
Do I need to replace both hot and cold cartridges on a two-handle faucet?
Not always. If only one side drips, replacing that side’s cartridge is often enough. Confirm hot and cold orientation carefully, because the two sides are not interchangeable.
What should I do if I cannot find the model number?
Remove the old cartridge and compare its shape, stem, markings and height with clear photos from the seller or manufacturer documentation. If you are unsure, a plumbing supply store can help match the part. For significant plumbing work, consult a licensed plumber.
Will a kit always work better than a single cartridge?
A kit can be useful when seals are also worn, but it is not automatically better. If the only problem is the cartridge, a single part is usually sufficient.
Conclusion
For most single-handle Delta bath faucets, a direct single-handle cartridge such as the Delta RP19803 or RP36181 is the most practical starting point. If you want closer factory behavior, the Delta RP46320 is worth considering after confirming the model. Two-handle owners should look at the Delta RP50256, and anyone rebuilding the whole valve may prefer the Delta RP20893 kit. The Delta RP1005 ceramic option suits people who want smoother operation over the long term. Whichever you choose, verify the series, handle type and stem height before ordering, and turn off the water supply before you begin.
