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If water keeps coming out of the tub spout while you’re trying to shower, or the flow won’t switch back to the showerhead, the diverter is the likely culprit. The good news is that you rarely need a new faucet to repair tub faucet diverter problems. Most failures come down to worn cup seals, a cracked gate or a tired valve stem, and replacement kits are sold for exactly these parts. This guide compares six kits on the criteria that matter most: whether the parts match a common tub spout design, how many components each kit includes, how clearly the listing describes compatibility, and what owners tend to report about fit and durability.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Enhon 2 Set Tub Spout Diverter Repair Kit (Chrome, Classic) | Homeowners who want spare parts for two diverters | Two complete sets of stems, seals and gates |
| Diverter Valve Repair Kit 4 Pcs 101237 for Moen 3800 Tub Spout | Moen 3800-style tub spouts with a worn gate | Four-piece kit matched to Moen 101237 parts |
| Tub Diverter Repair Kit 3 Pcs 101237 for Moen 3800 Tub Spout | Budget-minded repairs on a single Moen-style spout | Compact three-piece kit with cup seal and gate |
| Moen 101237 Cup Seal and Diverter Gate, 3800 Tub Spout | Owners who only need the cup seal and gate | OEM-style replacement for the 3800 spout |
| Shower Diverter Repair Kit, 2pcs Tub Spout Diverter Repair Kit | Leaky tub spouts with worn valve stems | Two stems, two seals and two gates |
| Universal Tub Spout Diverter Repair Kit Parts 2 Set (Classic, Chrome) | Mixed or unidentified tub spout brands | Universal-style parts in two sets |
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)
This kit suits homeowners who expect to repair more than one tub spout, or who want a spare set on hand before a leak starts. Owners often mention that having two complete sets makes it easier to try a fit without committing to the first attempt.
Key specs
- Two sets, each with a diverter valve stem, cup seal and gate
- Chrome finish, classic style
- Designed for bathroom tub spout diverters
Pros
- Two full sets give you a spare for future leaks
- Covers the stem, seal and gate in one order
- Chrome finish is a common match for standard tub spouts
Cons
- Fit depends on matching your spout’s internal dimensions, so measure first
- Classic styling may not match a modern spout finish
Diverter Valve Repair Kit, Plastic & Rubber, 4 Pcs 101237 for Moen 3800 Tub Spout
Diverter Valve Repair Kit, Plastic & Rubber, Bathroom, Sink Faucet Parts, Plumbing Fixture, Shower Repair Replacement Parts 4 Pcs 101237 Cup Seal & Diverter Gate for Moen 3800 Tub Spout
Best suited to owners with a Moen 3800-style tub spout whose diverter gate has stopped sealing. The four-piece count gives you extra seals and gates in case the first replacement doesn’t hold.
Key specs
- Four pieces including cup seal and diverter gate
- Plastic and rubber construction
- Built around Moen 101237 replacement parts
Pros
- Extra pieces cover minor misfits or a second attempt
- Matches a widely used Moen tub spout design
- Plastic and rubber parts are standard for diverter gates
Cons
- Only useful if your spout is a compatible Moen 3800 style
- Plastic parts can wear faster than brass in hard-water homes
Tub Diverter Repair Kit, Plastic & Rubber, 3 Pcs 101237 for Moen 3800 Tub Spout
Tub Diverter Repair Kit, Plastic & Rubber, Bathroom, Sink Faucet Parts, Plumbing Fixture, Shower Repair Replacement Parts 3 Pcs 101237 Cup Seal & Diverter Gate for Moen 3800 Tub Spout
A straightforward option for a single leaking Moen-style spout where you mainly need the cup seal and gate. It is a practical choice when you want to keep the parts list short.
Key specs
- Three pieces including cup seal and diverter gate
- Plastic and rubber construction
- Designed for Moen 101237 tub spout diverters
Pros
- Shorter parts list makes identification simpler
- Targets the two parts that most often fail
- Good fit for a one-spout repair
Cons
- Fewer spare pieces than the four-piece version
- Same compatibility limits as other Moen 3800-style kits
Moen 101237 Cup Seal and Diverter Gate, 3800 Tub Spout
Moen 101237 Moen Cup Seal & Diverter Gate, 3800 Tub Spout
This is the most targeted option: a manufacturer-branded replacement for the cup seal and gate in Moen’s 3800 tub spout. It suits owners who have already confirmed the failed part and don’t need valve stems.
Key specs
- Part number 101237 (cup seal and diverter gate)
- Made for the Moen 3800 tub spout
- Single replacement set rather than a multi-part kit
Pros
- Brand-specific part reduces guesswork on fit
- Simple to order when you know the part number
- Keeps the repair focused on the usual failure points
Cons
- Does not include valve stems if those are also worn
- Only works on Moen 3800-compatible spouts
Shower Diverter Repair Kit, Leaky Bathtub Faucet Replacement Parts, 2pcs Tub Spout Diverter Repair Kit
Shower Diverter Repair Kit, Leaky Bathtub Faucet Replacement Parts, Bathtub Spout for Fixing 2pcs Tub Spout Diverter Repair Kit, 2 Valve Stems, 2 Seals & Diverter Gates
Aimed at leaky tub spouts where the valve stem may be part of the problem. Including two stems, seals and gates gives you more coverage than a seal-only kit when the diverter has been leaking for a while.
Key specs
- Two valve stems, two seals and two diverter gates
- Intended for leaky bathtub spout diverters
- Replacement parts for a shower-and-tub diverter setup
Pros
- Covers the stem as well as the seal and gate
- Useful when a leak appears at the spout base
- Two of each part allows a second attempt
Cons
- Compatibility should be confirmed against your spout before ordering
- Replacing a stem can be fiddlier than swapping a gate
Universal Tub Spout Diverter Repair Kit Parts, 2 Set (Classic, Chrome)
2 Set Universal Tub Spout Diverter Repair Kit Parts, Includes 2 x Diverter Valve Stems, 2 x Cup Seals and 2 x Gates, Bathroom Shower Bathtub Leaky Faucet Repair Replacement Parts (Classic,Chrome)
Best for owners who don’t know the spout brand, or whose spout is an older or non-standard design. The “universal” wording means it is meant to fit a range of spouts rather than one model.
Key specs
- Two sets, each with valve stem, cup seal and gate
- Chrome, classic finish
- Universal-style parts for multiple tub spout types
Pros
- Broader intended fit when the brand is unknown
- Two complete sets give spare parts
- Covers all three diverter components
Cons
- “Universal” parts rarely fit every spout perfectly, so measure first
- Owners sometimes report needing to trim or adjust for a snug fit
Buying Guide
Selection criteria
The biggest risk when you repair tub faucet diverter parts is buying the wrong fit. Tub spouts come in threaded and slip-fit designs, and diverter internals vary between brands and even between model years. The criteria used in this guide were specification clarity, whether the kit names a specific spout model, how many of the three common failure parts are included, and patterns in owner feedback about fit and longevity.
Important features
- Parts included: A cup seal and diverter gate are the most common failures. A valve stem is worth adding if the leak persists after replacing the seal.
- Material: Plastic and rubber parts are standard for many diverters. Brass components last longer in hard-water areas but cost more to produce, so check what the kit specifies.
- Finish: Chrome and classic finishes are typical. Match the finish of your existing spout if any exposed piece is visible.
Specs to check
- Brand and model of your tub spout, usually stamped on the spout body or in the original manual
- Thread type and spout diameter, measured with calipers if possible
- Number of pieces and whether each set is complete
- Whether the listing names a specific model such as Moen 3800 or Moen 101237
Choosing by need
If you know your spout is a Moen 3800 and only the seal has failed, a targeted cup seal and gate kit keeps the repair simple. If you are not sure which part is leaking, a kit with a stem, seal and gate gives you the most coverage. For an unidentified spout, a universal kit is the practical starting point, though you should expect some fitting work.
Things to watch out for
- Shut off the water supply or the house valve before removing the spout, then cover the drain to avoid losing small parts.
- Do not overtighten the spout when reinstalling, which can crack the housing.
- If a leak continues after replacing the seal and gate, check the valve stem and the threads before assuming the kit was defective.
- For concealed pressure-balance valves or plumbing behind the wall, consult a licensed plumber rather than forcing parts.
For more background on the repair itself, see Repair Tub Faucet Drip: 7 Best Fixes and Replacement Parts Compared and 7 Best Tub Faucet Repair Kits for Common Leaks and Drips (2026). If you are working with a Delta fixture, Delta Faucet Repair Kits: How to Choose and Use the Right One explains how to match parts to that brand.
FAQ
How do I know if my tub diverter is the problem?
If water flows from the tub spout when the shower is on, or the showerhead gives weak flow, the diverter is the usual cause. Lift the diverter knob or pull the spout up to see whether the gate moves freely. Sticking or leaking at the spout base points to a worn seal or stem.
Do I need to replace the whole tub spout?
Usually not. Most diverter failures involve the cup seal, gate or stem, and these can be replaced separately. Replacing the whole spout is only needed if the housing is cracked or the threads are damaged.
What is the difference between a cup seal and a diverter gate?
The cup seal creates a watertight connection between the spout and the diverter body, while the gate directs water either to the spout or to the showerhead. A worn seal often causes dripping from the spout, and a worn gate often causes water to split between the spout and the shower.
Can I use a universal kit on any tub spout?
Universal kits are designed to fit a range of spouts, but no kit fits every design perfectly. Measure your spout’s internal diameter and thread type first, and expect that some kits may need slight adjustment for a snug fit.
Why does my tub spout still leak after replacing the diverter parts?
Possible causes include a worn valve stem, damaged threads, mineral buildup or a crack in the spout housing. Clean the seating surfaces, check that the new parts are seated correctly, and inspect the spout body for cracks before ordering additional parts.
Is it safe to do this repair myself?
Replacing a tub spout diverter is a common DIY task when the water is shut off and the parts match your spout. If the valve is concealed behind the wall, or the plumbing shows signs of corrosion or water damage, consult a licensed plumber.
Conclusion
To repair tub faucet diverter problems efficiently, start by identifying your spout. If you have a Moen 3800 and only the seal has failed, the Moen 101237 cup seal and gate is the most direct choice. If the leak has been going on for a while, a kit that includes a valve stem, such as the Shower Diverter Repair Kit with two stems, seals and gates, gives better coverage. Owners with an unknown spout brand will find the universal parts the most flexible starting point, provided they measure before installing. For spares on hand, the two-set kits from Enhon and the universal option offer the most replacement pieces.
