By Caleb MorganUpdated November 2026
Leaking bathtub faucet repair usually comes down to one of a handful of worn parts: a cup seal, a diverter gate, a rubber washer or a valve cartridge. The right kit depends on where the water is escaping, which is why this list is organized around the most common leak sources. Every pick below was chosen on the basis of specifications, brand reputation and the patterns owners tend to describe in their reviews, with an eye toward compatibility, parts count and how clearly each kit is labeled.
Our top picks at a glance
- 1
TOP CHOICEBest overallFaucet Washers & Sealing Gaskets to Fix Leaky Faucets, Hoses, Spigots,View on Amazon - 2
TOP CHOICEBest for tub spout diverter leaks1 Set Bathtub Spray Diverter Repair Kit Chrome Diverter Stem Cup SealView on Amazon - 3
TOP CHOICEBest for Moen tub spoutsTap Accessories, Plastic & Rubber, Bathroom, Sink Faucet Parts, PlumbiView on Amazon - 4
Best two-pack valueEnhon 2 Set Tub Spout Diverter Repair Kit (Chrome, Classic)View on Amazon - 5
Best budget pick for washer leaks106 PCS Faucet Washer Assortment Kit with Assorted Flat and Beveled RuView on Amazon - 6
Best for Delta single-handle tubsDanco Cartridge Repair Kit for Delta Single-Handle Faucet, Brass (86970)View on Amazon
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Faucet Washers & Sealing Gaskets 1075 PCS Universal Plumbing Repair Kit | Mixed washer and gasket leaks | 1,075 pieces across 37 sizes |
| 1 Set Bathtub Spray Diverter Repair Kit Chrome | Diverter leaks from the tub spout | Complete diverter stem, cup seal and gate |
| Tap Accessories Cup Seal & Diverter Gate for Moen 3800 | Moen tub spouts | Model-matched cup seal and gate |
| Enhon 2 Set Tub Spout Diverter Repair Kit | Two-location fixes or spare parts | Two complete sets in chrome and classic styles |
| 106 PCS Faucet Washer Assortment Kit | Budget washer replacement | Flat and beveled rubber washers in assorted sizes |
| Danco Cartridge Repair Kit for Delta (86970) | Delta single-handle tub and shower valves | Brand-specific cartridge kit |
Faucet Washers & Sealing Gaskets to Fix Leaky Faucets, Hoses, Spigots, Plumbing Fixtures with Pick Hook 1075 PCS 37 Sizes 3-in-1 Universal Plumbing Repair Kit & O-Rings
Faucet Washers & Sealing Gaskets to Fix Leaky Faucets, Hoses, Spigots, Plumbing Fixtures with Pick Hook 1075 PCS 37 Sizes 3-in-1 Universal Plumbing Repair Kit & O-Rings
Best for: Homeowners who are not yet sure which part is worn
This is a broad assortment for anyone who wants to cover several possibilities in one purchase. Because a dripping tub spout is often caused by a worn washer or O-ring rather than a failed cartridge, having many sizes on hand can save a second trip to the hardware store.
Key specs:
- 1,075 pieces in 37 sizes
- Includes washers, sealing gaskets and O-rings
- Pick hook included for removing old seals
Pros:
- Covers many common washer and O-ring sizes
- Useful beyond the bathtub for other faucets
- The pick hook helps with removing stubborn old seals
Cons:
- Finding the exact match can take some trial and error
- Sizes are not labeled for a specific brand or model
Bottom line: A strong first purchase if you want to diagnose and fix a range of leaks without guessing sizes one at a time.
1 Set Bathtub Spray Diverter Repair Kit Chrome Diverter Stem Cup Seal Gate One each Bathroom Shower Tub Leaking Faucet Repair Replacement Parts
1 Set Bathtub Spray Diverter Repair Kit Chrome Diverter Stem Cup Seal Gate One each Bathroom Shower Tub Leaking Faucet Repair Replacement Parts
Best for: Water leaking from the tub spout when the shower is running
When water dribbles out of the spout while showering, the diverter gate or its cup seal is usually the culprit. A complete one-set kit lets you replace the whole diverter assembly rather than guessing at a single component.
Key specs:
- One complete set: diverter stem, cup seal and gate
- Chrome finish
- Designed for tub and shower diverter replacement
Pros:
- Replaces the full diverter assembly in one step
- Chrome finish matches most standard tub fixtures
- Straightforward for a first-time repair
Cons:
- Fit depends on your spout design, so check before ordering
- Not a fix for cartridge or handle leaks
Bottom line: Best suited to someone whose spout drips only when the diverter is engaged.
Tap Accessories, Plastic & Rubber, Bathroom, Sink Faucet Parts, Cup Seal & Diverter Gate for Moen 3800 Tub Spout
Tap Accessories, Plastic & Rubber, Bathroom, Sink Faucet Parts, Plumbing Fixture, Shower Repair Replacement Parts 5 Pcs 101237 Cup Seal & Diverter Gate for Moen 3800 Tub Spout
Best for: Moen tub spouts that leak from the diverter
Moen tub spouts use their own diverter geometry, so a model-matched cup seal and gate are more likely to seal properly than a generic part. Owners of Moen 3800-series spouts tend to look for exactly this kind of targeted replacement.
Key specs:
- Five pieces, including cup seal and diverter gate
- Labeled for the Moen 3800 tub spout
- Plastic and rubber construction
Pros:
- Labeled for a specific Moen tub spout
- Small, focused parts set that is easy to identify
- Good for replacing only the worn seal and gate
Cons:
- Only useful if your spout matches the labeled model
- Limited to diverter components
Bottom line: The right choice for Moen owners who have confirmed their spout model before buying.
Enhon 2 Set Tub Spout Diverter Repair Kit (Chrome, Classic)
Includes 2 x Diverter Valve Stems, 2 x Cup Seals and 2 x Gates, Bathroom Shower Bathtub Leaky Faucet Repair Replacement Parts Enhon 2 Set Tub Spout Diverter Repair Kit (Chrome, Classic)
Best for: Two-location repairs or keeping a spare set on hand
Two complete sets make sense if you have two tubs or want to replace a diverter and keep an identical spare. The chrome and classic styling options help with matching existing hardware.
Key specs:
- Two diverter valve stems, two cup seals and two gates
- Chrome and classic finish options
- Designed for bathtub and shower diverter repair
Pros:
- Two full sets provide a useful spare
- Covers a complete diverter assembly
- Good for multi-bath households
Cons:
- Paying for a second set makes sense only if you need it
- Compatibility should be checked against your existing spout
Bottom line: A practical pick for households with more than one tub or anyone who wants a spare on the shelf.
106 PCS Faucet Washer Assortment Kit with Assorted Flat and Beveled Rubber Washers for Outdoor Garden Faucet Stem Leak Worn Replacement Repair
106 PCS Faucet Washer Assortment Kit with Assorted Flat and Beveled Rubber Washers for Outdoor Garden Faucet Stem Leak Worn Replacement Repair
Best for: Budget-minded washer replacement across several fixtures
Worn rubber washers are among the most frequent causes of drips at a tub spout or handle stem. A large assortment of flat and beveled washers lets you match the original part by feel and size without buying a complete kit.
Key specs:
- 106 pieces
- Assorted flat and beveled rubber washers
- Suitable for faucet stem leaks
Pros:
- Inexpensive way to stock common washer sizes
- Both flat and beveled styles included
- Useful across several faucets in the house
Cons:
- Washers alone do not address diverter or cartridge failure
- Owners often need to compare sizes carefully before installing
Bottom line: A sensible budget choice if you suspect a worn washer and are willing to match the size yourself.
Danco Cartridge Repair Kit for Delta Single-Handle Faucet, Brass (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: Delta single-handle tub and shower valves that leak at the handle
When a single-handle valve drips even with the handle off, the cartridge is typically worn and needs replacement. Danco is a long-established maker of cartridge replacement parts, and this kit is labeled for a specific Delta model number.
Key specs:
- Brand-specific cartridge kit labeled for Delta single-handle faucets
- Brass and rubber components
- Model reference 86970
Pros:
- Replaces the cartridge that controls flow and temperature
- Labeled by model, which simplifies matching
- Addresses leaks that washers cannot fix
Cons:
- Only fits Delta single-handle designs
- You must confirm the model before ordering
Bottom line: The right pick for Delta single-handle owners whose handle leaks even when closed.
Buying Guide
Identify the Source of the Leak
Before buying anything, find where the water is going. Drips from the spout when the shower is on point to the diverter. Water that runs from the handle or the base of the handle when the valve is closed usually means a cartridge or stem problem. Constant dripping from the spout with the valve off often points to a worn washer or seat. Turn off the water supply, then open the valve to see which component is wearing.
Good picks for this: Faucet Washers & Sealing Gaskets 1075 PCS Universal Plumbing Repair Kit, Danco Cartridge Repair Kit for Delta (86970)
Match the Brand and Model
Compatibility is the single most common reason a kit fails. Tub spouts, diverter gates and cartridges are not interchangeable across brands. Look for the brand stamped on the handle or spout, and note the model number if you can find it. Kits labeled for a specific maker, such as Moen or Delta, are easier to match than universal assortments.
Good picks for this: Tap Accessories Cup Seal & Diverter Gate for Moen 3800, Danco Cartridge Repair Kit for Delta (86970)
Diverter Assembly Components
A complete diverter assembly usually includes a stem, a cup seal and a gate. Worn cup seals are a frequent source of spout leaks, while a worn gate can prevent the diverter from fully sealing. Replacing the whole assembly rather than one part can avoid a second repair a few months later.
Good picks for this: 1 Set Bathtub Spray Diverter Repair Kit Chrome, Enhon 2 Set Tub Spout Diverter Repair Kit
Size and Fit
Washers and O-rings are sold in fractional inch sizes and metric equivalents. Before ordering, remove the old part and measure its outside diameter and thickness with calipers or a ruler. Bring the old washer to the store if you are unsure. Large assortments help because they let you test several sizes, but measuring first still saves time.
Good picks for this: 106 PCS Faucet Washer Assortment Kit, Faucet Washers & Sealing Gaskets 1075 PCS Universal Plumbing Repair Kit
Material and Finish
Rubber components wear with heat, minerals and age, so choose parts rated for hot water. Brass cartridges generally outlast plastic in high-use valves. Chrome finishes help a replacement blend in with the existing spout, which matters if the rest of the fixture is still in good condition.
Good picks for this: Danco Cartridge Repair Kit for Delta (86970), Enhon 2 Set Tub Spout Diverter Repair Kit
Scope of the Repair
Think about how much work you want to do. A single washer is a quick fix, while a cartridge replacement involves removing the handle and trim. Broader kits with many pieces suit trial-and-error repairs, and model-specific kits suit a targeted job. Choose based on whether you want to fix one leak or stock parts for future repairs.
Good picks for this: Bathtub Spray Diverter Repair Kit Chrome, 106 PCS Faucet Washer Assortment Kit
Shutting Off Water and Working Safely
Always close the water supply before disassembling a valve, and open the tub faucet briefly afterward to relieve pressure. Work on a towel or rubber mat so small parts do not roll into the drain. If you are unsure about the valve type or the shutoff valves are seized, a licensed plumber can handle the job safely.
Good picks for this: Faucet Washers & Sealing Gaskets 1075 PCS Universal Plumbing Repair Kit
FAQ
Why does my bathtub faucet leak even when it is turned off?
A worn washer, seat or cartridge typically allows water to pass when the valve is closed. Turn off the supply, remove the handle and inspect the valve. Replacing the worn component usually stops the drip.
Why does water come out of the tub spout when the shower is on?
This usually means the diverter is not sealing fully. A worn cup seal or gate lets water escape from the spout instead of being directed up to the showerhead. Replacing the diverter assembly often resolves it.
Can I repair a leaking bathtub faucet without shutting off the main water?
In many homes you can close the individual shutoff valves for the tub, if they exist. If they are missing or seized, you will need to shut off the main supply. Consult a licensed plumber if you are unsure how to isolate the water safely.
How do I know which washer size to buy?
Remove the old washer and measure its outside diameter and thickness. Bring it to a hardware store or compare it against a size chart. Assortment kits let you test several sizes at once.
Is a cartridge replacement harder than a washer replacement?
Yes. A washer repair often requires only removing the spout or stem, while a cartridge job involves removing the handle, trim and sometimes the escutcheon. Expect more steps and a few more parts to handle.
Do I need to match the faucet brand when buying a kit?
For cartridges and diverter components, yes. Parts from different manufacturers are often not interchangeable even when they look similar. Confirm the brand and model before ordering.
When should I call a plumber instead of repairing it myself?
Call a professional if the valve is corroded or seized, if the supply lines leak, or if you find damage inside the wall. Water damage behind tile or drywall can become costly quickly, so a licensed plumber is the safer choice in those cases.
Conclusion
For most leaking bathtub faucet repair jobs, the fastest route is to identify the failing part first and then buy a kit that matches it. If the spout drips only when the shower is on, a diverter kit such as the Bathtub Spray Diverter Repair Kit or, for Moen spouts, the Tap Accessories Cup Seal & Diverter Gate is the logical start. If a Delta single-handle valve leaks at the handle, the Danco Cartridge Repair Kit for Delta (86970) addresses the cartridge directly. For washer drips and general stock, the 1075 PCS universal kit or the 106 PCS washer assortment offers the widest coverage.
For step-by-step help with specific valve types, see Delta Bathtub Faucet Repair Kit: Step-by-Step Fix for Leaks and Drips and Repair Tub Faucet Drip: A Step-by-Step Guide to Stop Leaks (2026). If your fixture is a Kohler model, Kohler Artifacts Bathtub Faucet: Identify, Repair and Maintain It (Step-by-Step) covers identification. Owners comparing diverter-specific options may also find Bathtub Faucet Diverter Repair Kit: 6 Best Picks for Leaks (2026) useful, and Bathtub Faucet Valve Repair Kits: 6 Best Picks for Leaks and Drips (2026) covers valve-level fixes.
Sources
- Water efficiency guidance on identifying and fixing household leaks (epa.gov)
- Home water heating and fixture efficiency recommendations (energy.gov)
- Plumbing code and fixture standards relevant to faucet and valve components
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.
