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If you need to repair tub faucet drip problems, the good news is that most drips come down to one worn part: a cartridge, a washer, a seat or an O-ring. The bad news is that tub faucets come in several designs, and a part that fits one brand will not fit another. This guide covers the selection criteria we used to narrow down the options, the products that fit different repair situations, and a buying guide so you can match the right parts to your faucet before you start taking things apart. Our picks are based on specifications, brand reputation and common owner feedback patterns. We have not tested these products ourselves.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Delta RP19805 Cartridge Assembly | Delta single-handle tub and shower faucets | Direct-replacement cartridge for a common Delta series |
| Moen 1225 Cartridge | Moen single-handle tub and shower valves | Matches many Moen single-control cartridges |
| Danco Universal Tub and Shower Faucet Repair Kit | Mixed or unknown brands | Assortment of stems, seats and O-rings |
| Danco 15HC Hot and Cold Stem Kit | Older two-handle compression tubs | Replaceable stems and washers for compression valves |
| Watts Kit Stem Faucet Repair Kit | Two-handle tub faucets with rubber washers | Basic washer and seat replacement set |
| Kohler Tub Spout Diverter Replacement | Drips from the spout when the shower is running | Replaces a worn diverter that lets water leak through |
| Pfister Universal Tub Faucet Cartridge Kit | Pfister-style single-handle tubs | Cartridge and O-ring set for Pfister valves |
Delta RP19805 Cartridge Assembly
This is a good fit for homeowners with a Delta single-handle tub or shower valve who have confirmed the cartridge is the source of the drip. A cartridge replacement is usually the most reliable fix for a single-handle valve that still drips after the handle is tightened.
Key specs
- Designed as a replacement cartridge for specific Delta single-handle valve series
- Ceramic disc or cartridge body, depending on the valve model
- Requires matching the cartridge number to your existing valve before purchase
Pros
- Addresses the most common source of drips in single-handle Delta valves
- Restores both flow control and temperature mixing in one part
- Owners often report it is a direct swap without modifying the valve body
Cons
- Only fits specific Delta series, so the model number must match
- Does not address drips caused by a worn spout diverter or a damaged valve body
Moen 1225 Cartridge
Suited to owners of Moen single-handle tub and shower valves who see water leaking from the spout or showerhead even when the handle is off. Confirm the cartridge number stamped on the old part or listed in your Moen parts diagram before ordering.
Key specs
- Single-handle cartridge for compatible Moen tub and shower valves
- Controls both water flow and temperature mixing
- Installed by removing the handle, trim and retaining clip
Pros
- Widely referenced replacement for many Moen single-control valves
- Replacement typically takes one trip to the hardware store once the part number is known
- Owners often report that a new cartridge solves drips that tightening did not
Cons
- Compatibility depends on the exact valve series; check before buying
- Older Moen valves may need a matching cam or seat replaced at the same time
Danco Universal Tub and Shower Faucet Repair Kit
A practical option when you do not know the brand of your tub faucet or want a range of common parts on hand. It suits DIYers who are still identifying the problem and prefer to have several small components available rather than one specific cartridge.
Key specs
- Assortment of stems, seats, washers and O-rings
- Designed to cover a range of compression and washer-style tub valves
- Includes common sizes used in older two-handle faucets
Pros
- Useful when the brand is unknown and you need to try several sizes
- Low-cost way to replace worn washers and O-rings in one order
- Owners often describe it as a good first kit before buying a cartridge
Cons
- Not a substitute for a dedicated cartridge in modern single-handle valves
- Matching the correct stem and seat takes trial and error without a parts diagram
Danco 15HC Hot and Cold Stem Kit
Aimed at older two-handle compression tubs where each handle controls a separate stem. If you turn a handle and it drips from the spout after it is closed, the stem washer or seat is usually the culprit.
Key specs
- Hot and cold stem set for compression-style two-handle faucets
- Includes replacement stem washers and O-rings
- Works with stems that use a standard threaded design
Pros
- Targets the most common cause of drips in two-handle tubs
- Keeps the existing faucet body, so you avoid a full replacement
- Owners often report a quick fix when a worn washer is the only problem
Cons
- Only suits compression stems; cartridge faucets need a different part
- Stems can be corroded and hard to remove, which may require penetrating oil
Watts Kit Stem Faucet Repair Kit
A basic set for homeowners who have confirmed a two-handle tub faucet is dripping at the spout and want replacement washers and seats. It works best when the valve body is in good shape and only the internal rubber parts have worn.
Key specs
- Replacement washers and seats for two-handle stem valves
- Sized for common faucet stems
- Designed for standard compression-style valves
Pros
- Inexpensive way to address worn rubber washers
- Simple parts that can be installed with basic hand tools
- Owners often report it solves slow drips from a worn seat
Cons
- Will not fix drips caused by a pitted or scored valve seat
- Limited to washer-style valves, so it does not cover cartridge tubs
Kohler Tub Spout Diverter Replacement
This is the right choice if the tub spout drips only when the shower is on, or if water keeps coming out of the spout while you are showering. The diverter is the valve that sends water up to the showerhead, and a worn one lets water leak through to the spout.
Key specs
- Replacement diverter for compatible Kohler tub spouts
- Installed on the spout body, usually without touching the main valve
- Check the spout connection size and thread type before ordering
Pros
- Addresses a drip that many people mistake for a valve problem
- Installation is typically limited to the spout and does not require opening walls
- Owners often report the spout stops dripping once the diverter is replaced
Cons
- Must match your Kohler spout style; universal fit is not guaranteed
- Does not repair a leaking cartridge or stem, so diagnose the source first
Pfister Universal Tub Faucet Cartridge Kit
Intended for Pfister single-handle tub valves where the cartridge has worn out and water is leaking even when the handle is closed. It is a sensible pick for owners who have identified their Pfister series and want a single set of parts.
Key specs
- Cartridge and O-ring set for compatible Pfister single-handle valves
- Controls flow and temperature in one component
- Confirm the valve series before installing
Pros
- Single-part fix for a leaking single-handle Pfister tub valve
- Includes the O-rings that often fail alongside the cartridge
- Owners often describe it as a cleaner solution than repeated tightening
Cons
- Compatibility varies by valve series, so verification is essential
- Not suitable for two-handle compression valves
Buying Guide
Selection Criteria
Start by identifying the valve type. Single-handle tubs use a cartridge, while two-handle tubs usually use stems with washers and seats. A tub spout diverter is a separate part and is often mistaken for the main valve. Brand compatibility matters because internal dimensions vary between manufacturers and even between model years.
Important Features
- Cartridge or stem type matching your valve
- Included O-rings, seals and washers
- Brand and series compatibility, confirmed against a parts diagram
- Whether the kit covers a single failure point or several
Specs to Check
- Cartridge number or model stamped on the old part
- Stem thread size and length for compression valves
- Spout connection size and diverter type
- Number of handles and whether the valve is single-control or two-handle
Choosing by Need
| Situation | Likely part |
|---|---|
| Single-handle tub drips from the spout with handle off | Cartridge matched to brand |
| Two-handle tub drips from the spout when closed | Stem, washer or seat kit |
| Spout drips only when the shower runs | Tub spout diverter |
| Brand unknown, several parts needed | Universal repair kit |
Things to Watch Out For
- Buying a cartridge without confirming the exact model number
- Replacing washers when the valve seat is actually pitted
- Forcing a corroded stem without penetrating oil, which can crack the valve body
- Turning off the water supply at the main or the valve stop before disassembling
For a broader view of faucet parts, see Moen Kitchen Faucet Replacement Parts: Find and Install the Right One and Kohler Kitchen Faucet Parts: How to Identify and Replace the Right Ones. Many of the same identification steps apply to tub valves. If you are working with a single-handle design, Single-Handle Kitchen Faucets: Control, Cartridges, Care explains how cartridges affect flow and mixing.
FAQ
How do I know if my tub faucet cartridge is the cause of the drip?
Turn the water off at the supply valve, remove the handle and check whether the cartridge is loose, cracked or has mineral buildup. If the drip continues after you have closed the handle fully, the cartridge or its O-rings are the most likely source.
Can I repair a tub faucet drip without removing the handle?
Generally no. Most tub valves require removing the handle, trim and retaining clip to reach the cartridge or stem. Some spout diverter drips can be checked without disassembling the valve body.
Why does my tub spout drip only when the shower is on?
This usually points to a worn diverter. The diverter directs water to the showerhead, and when it fails, water can escape through the spout even while the shower is running.
Do I need to replace all the O-rings when I replace a cartridge?
It is a good idea. O-rings are inexpensive and often wear at the same rate as the cartridge. Replacing them during the same repair prevents a second drip from a worn seal.
What tools do I need for a tub faucet repair?
Most repairs need an adjustable wrench, a flathead or Phillips screwdriver, a valve or cartridge puller for stuck parts, plumber’s grease and penetrating oil for corroded fittings. Keep a towel or rag over the drain to catch small parts.
When should I call a professional?
If the valve body is cracked, the seat is damaged beyond reach, or you cannot shut off the water to the tub, a licensed plumber should handle the repair. Shut-off valves in older homes can fail, so consult a professional before forcing them.
Will a universal kit work on any tub faucet?
Not reliably. Universal kits can cover common washers and seats, but single-handle cartridges and spout diverters are brand-specific. Always confirm compatibility before assuming a kit will fit.
Conclusion
To repair tub faucet drip problems effectively, start by identifying whether your tub uses a single-handle cartridge, a two-handle stem or a spout diverter. A Delta or Moen cartridge suits single-handle valves from those brands, while Danco and Watts stem kits cover two-handle compression tubs. Choose a Kohler diverter if the drip only happens when the shower runs, and consider a universal kit if you are still identifying the brand. Matching the part number to your valve is the single step that prevents most wasted trips to the store.
