By Caleb MorganUpdated November 2026
Shopping for moen bathtub faucet replacement parts can feel harder than it should. Moen has made many tub faucet series over the years, and a cartridge that fits one handle may not fit another. This guide compares four well-known options so you can match a part to your faucet, whether you need to stop a drip, restore water flow, or redirect water from the tub spout to the showerhead. Each pick was chosen by comparing manufacturer specifications, brand reputation for Moen compatibility, and recurring owner feedback about fit and leak performance. We have not tested these parts ourselves, so always confirm compatibility against your faucet’s model number before ordering.
Our top picks at a glance
- 1
TOP CHOICEBest overallPosi-Temp Tub and Shower Replacement Cartridge (Moen 1222)View on Amazon - 2
Best for tub spout diverter repairsDiverter Valve Repair Kit for Moen 3800 Tub SpoutView on Amazon - 3
Best for older Magnum-style faucetsGenuine Moen 1225 Magnum One-Handle Faucet Cartridge Replacement KitView on Amazon - 4
Best budget pick for two-handle faucetsMoen 1234 Duralast Handle Replacement CartridgeView on Amazon
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Moen 1222 Posi-Temp Single-Handle Replacement Cartridge | Single-handle tub and shower faucets | Posi-Temp pressure-balancing design |
| Diverter Valve Repair Kit for Moen 3800 Tub Spout | Restoring diverter function | Cup seal and diverter gate set |
| Moen 1225 Magnum One-Handle Cartridge Kit | Older one-handle Moen faucets | Brass body with replacement kit |
| Moen 1234 Duralast Handle Replacement Cartridge | Two-handle faucets on a budget | Hot or cold replacement cartridge |
Posi-Temp Tub and Shower Replacement Cartridge (Moen 1222)
posi-Temp Tub and Shower Replacement Cartridge, authentic Moen faucet cartridge replacement part Moen 1222 Single-Handle Replacement Cartridge, Posi-Temp
Best for: Overall repair of single-handle tub and shower faucets
This cartridge suits homeowners whose single-handle tub or shower faucet has started to drip, stiffen, or deliver scalding water swings. It is the most common replacement path for Moen single-handle valves that use the Posi-Temp pressure-balancing design.
Key specs
- Single-handle replacement cartridge
- Posi-Temp pressure-balancing mechanism
- Designed as a direct swap for compatible Moen tub and shower valves
Pros
- Pressure balancing helps limit sudden temperature changes during use
- Straightforward swap that avoids replacing the full valve body
- Widely available as a genuine Moen part
Cons
- Only fits faucets that use this cartridge style, so model matching is essential
- Owners sometimes report that a worn valve body needs replacing alongside the cartridge
Bottom line: A strong first choice for most single-handle Moen tub and shower leaks, provided you confirm the cartridge number against the old one.
Diverter Valve Repair Kit 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 for: Fixing a tub spout that will not divert water to the showerhead
If water keeps coming out of the spout when you want the shower on, the diverter gate or cup seal is usually the culprit. This kit targets that specific problem on Moen 3800-style tub spouts rather than the faucet handle valve.
Key specs
- Four-piece set including cup seal and diverter gate
- Plastic and rubber construction
- Intended for Moen 3800 tub spout diverter repair
Pros
- Addresses diverter failure without replacing the whole spout
- Inexpensive way to test whether the diverter is the real cause of low shower flow
- Small parts are easy to install with basic hand tools
Cons
- Plastic components may wear faster than brass parts over many years
- Does not repair leaks at the handle or cartridge, so it will not help a dripping faucet
Bottom line: The right pick if your problem is diverting water, not a drip from the handle. Check that your spout matches the 3800 series before buying.
Genuine Moen 1225 Magnum One-Handle Faucet Cartridge Replacement Kit
Genuine Moen Part, For Kitchen and Bathroom Faucets Moen 1225 Magnum One-Handle Faucet Cartridge Replacement Kit, Brass
Best for: Older one-handle Moen faucets using the Magnum-style cartridge
This kit suits owners of older one-handle Moen faucets, both in bathrooms and kitchens, whose original cartridges have worn out. Because older faucets are often discontinued, matching the cartridge number is the most important step.
Key specs
- One-handle faucet cartridge replacement kit
- Brass construction
- Listed as a genuine Moen part
Pros
- Brass body is generally more durable than plastic-bodied alternatives
- Genuine Moen part helps preserve original water flow and handle feel
- Useful for faucets where the original cartridge is no longer sold separately
Cons
- Fit is limited to specific older Moen models, so compatibility checks take time
- Installation may require removing the handle and retaining nut, which can be stubborn on older fixtures
Bottom line: Best for owners who have confirmed their faucet uses the Magnum-style cartridge and want a durable brass replacement.
Moen 1234 Duralast Handle Replacement Cartridge
2-handle cartridge, bathroom and kitchen compatibility, Duralast design, hot or cold replacement, repair part Moen 1234 Duralast Handle Replacement Cartridge
Best for: Budget-minded repairs on two-handle faucets
This cartridge targets two-handle faucets where one side, hot or cold, has stopped working properly. It suits homeowners who want a lower-cost repair that still uses a Moen-branded part.
Key specs
- Two-handle replacement cartridge
- Usable on hot or cold side as a replacement part
- Part of the Duralast replacement line
Pros
- Lower-cost option compared with full valve replacements
- Compatible with both bathroom and kitchen two-handle faucets in the listing description
- Quick swap when only one side leaks or sticks
Cons
- Duralast parts are often reported by owners as less robust than premium cartridges over long use
- Owners sometimes find the handle and cartridge do not line up with older Moen bodies
Bottom line: A sensible budget choice for two-handle Moen faucets, as long as you verify the cartridge fits your valve before installing.
Buying Guide
Identify your faucet series and model number
Moen uses many cartridge types across its tub, shower, and sink lines. The model number is usually stamped on the valve body, the handle, or the escutcheon plate. Write it down before you shop, because a part that matches one series can look nearly identical to another yet fail to seal. Measure the cartridge height and stem diameter if you have the old part on hand.
Good picks for this: Moen 1222 Single-Handle Replacement Cartridge, Moen 1225 Magnum One-Handle Cartridge Kit
Single-handle versus two-handle designs
Single-handle faucets use one cartridge to control both temperature and flow, while two-handle faucets typically use separate cartridges or valve stems for hot and cold. Buying a single-handle cartridge for a two-handle valve, or the reverse, is one of the most common mistakes. Count the handles before ordering.
Good picks for this: Moen 1234 Duralast Handle Replacement Cartridge, Moen 1222 Single-Handle Replacement Cartridge
Diverter and spout compatibility
If your tub uses a diverter to send water to the showerhead, check whether the problem lies in the spout diverter or in the valve. Diverter parts are usually sold separately from cartridges. Confirm the spout series before buying a diverter kit, since fit varies between models.
Good picks for this: Diverter Valve Repair Kit for Moen 3800 Tub Spout
Material and durability
Brass bodies generally resist corrosion and wear better than plastic components, which matters most in hard-water areas. Plastic parts can work well for light-duty repairs but may degrade sooner under constant use or high temperatures. Look at the listed material before you buy.
Good picks for this: Moen 1225 Magnum One-Handle Cartridge Kit, Moen 1222 Single-Handle Replacement Cartridge
Use case: leak, low flow, or stiff handle
A dripping spout usually points to a worn cartridge or seals, while low shower pressure often comes from a clogged aerator or a failing diverter. A stiff handle can mean mineral buildup or a worn stem. Diagnose the symptom first so you do not replace a part that was never the problem.
Good picks for this: Moen 1222 Single-Handle Replacement Cartridge, Diverter Valve Repair Kit for Moen 3800 Tub Spout
Budget and repair scope
Replacing only a cartridge is cheaper and faster than replacing a full valve body, but it only works if the valve body is still sound. If the body is corroded or cracked, a cartridge alone will not stop the problem. Weigh the age of the faucet against the likely repair scope.
Good picks for this: Moen 1234 Duralast Handle Replacement Cartridge, Moen 1225 Magnum One-Handle Cartridge Kit
Installation tools and care
Most cartridge swaps need a screwdriver, an adjustable wrench or cartridge puller, and plumber’s grease. Turn off the water supply before starting, and cover the drain to avoid losing small parts. Clean mineral deposits from the valve seat during installation, and test the faucet slowly after reassembly.
Good picks for this: Moen 1222 Single-Handle Replacement Cartridge, Moen 1234 Duralast Handle Replacement Cartridge
FAQ
Can I use one Moen cartridge for every tub faucet?
No. Moen uses different cartridge designs across its series, and even similar-looking cartridges may differ in height, stem shape, or seal placement. Always match the cartridge number to your existing part or to the model number on your valve.
How do I know if the cartridge or the diverter is causing my problem?
If water drips from the faucet handle when it is off, the cartridge or its seals are the likely cause. If the faucet runs normally but water comes out of the spout when you want the showerhead, the diverter is the more probable culprit.
Do I need to replace the valve body when I replace the cartridge?
Not always. A cartridge swap is sufficient when the valve body is intact and free of cracks or heavy corrosion. If the body is damaged, replacing the cartridge alone will not solve the leak.
Are plastic diverter parts reliable?
Plastic diverter components are common and can work well for many years, but owners sometimes report wear sooner than with brass parts. Expect them to be a repair part rather than a permanent upgrade in harsh water conditions.
Should I turn off the water before replacing a cartridge?
Yes. Shut off the supply valves, or the main water supply if local valves are missing, and open the faucet to relieve pressure before removing any parts. This prevents water from spraying during removal.
What tools do I need for a cartridge replacement?
Most jobs require a screwdriver, an adjustable wrench, a cartridge puller for stuck parts, and plumber’s grease for new O-rings. Keep a towel and a small container for screws and clips nearby.
When should I call a plumber?
If the valve body is corroded, cracked, or leaking from the wall connection, or if you are unsure how to shut off the water safely, consult a licensed plumber. Gas and electrical work is not involved in these repairs, but water damage can be costly, so professional help is reasonable.
Conclusion
For most single-handle Moen tub and shower leaks, the Moen 1222 Posi-Temp cartridge is the most versatile starting point, provided the model number matches. If your problem is water that will not divert to the showerhead, the diverter repair kit for the 3800 spout is the more targeted fix. Owners of older one-handle Magnum-style faucets should look at the Moen 1225 brass kit, and budget-minded repairs on two-handle faucets may suit the Moen 1234 Duralast cartridge. Confirm compatibility first, and you will avoid the most common reason repairs fail.
Sources
- Guidance on water heating and fixture efficiency that can help you decide when to repair or replace faucet components (energy.gov)
- WaterSense information on fixture performance and leak detection in household plumbing (epa.gov)
- Consumer safety information on scald risks and safe water temperature settings (cpsc.gov)
Related reading
- Moen Kitchen Faucet Replacement Parts: Find and Install the Right One
- Moen Bathtub Faucet Parts: Identify, Source and Replace the Right Ones
- Delta Bathtub Faucet Replacement Parts: Find and Install the Right Ones
- Moen Tub Faucet Cartridge: Step-by-Step Replacement Guide (2026)
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.
