1. Product Overview
The Moen UT2661 Vichy M-CORE 2-Series 1-Handle Shower Trim Kit is designed to provide a modern and functional showering experience. This trim kit, featuring a chrome finish, is part of the M-CORE universal valve system, which simplifies installation and offers flexibility in design and functionality. It requires an M-CORE Mixing Valve (U140) for complete installation, which is sold separately.
Key features include:
- Versatile Design: Chrome finish provides a reflective, mirror-like appearance suitable for various decorating styles.
- Pressure-Balancing Capability: M-CORE universal valves, when paired with 2-Series trim, control temperature fluctuations caused by water pressure changes.
- Adaptable M-CORE System: Allows for functionality and style changes without needing to remove or replace the valve once roughed-in.
- Streamlined Installation: Features an integrated mounting bracket for direct valve attachment to a brace.
- Integrated Test Cap: Enables easy flushing and testing of the system without cartridge removal.

Figure 1: Moen UT2661 Vichy M-CORE 2-Series 1-Handle Shower Trim Kit in Chrome.
2. Safety Information
Please read all instructions carefully before installation and use. Failure to follow these instructions may result in personal injury or property damage.
- Always turn off the main water supply before beginning any plumbing work.
- Wear appropriate personal protective equipment, such as safety glasses and gloves.
- If you are unsure about any part of the installation process, consult a qualified plumber.
- Ensure all connections are secure and leak-free before restoring water supply.
- Do not overtighten components, as this may cause damage.
- Keep small parts away from children.
3. Package Contents
Verify that all components are present before beginning installation.
- Shower Trim Plate
- Handle Assembly
- Mixing Valve Cartridge
- Temperature Limit Stop
- Mounting Hardware
Note: The M-CORE Mixing Valve (U140) is required for installation and is sold separately. Ensure you have the correct valve before proceeding.

Figure 2: M-CORE Mixing Valve U140 (sold separately), required for installation.
4. Specifications
| Feature | Detail |
|---|---|
| Model Number | UT2661 |
| Brand | Moen |
| Material | Zinc, Metal Handle |
| Finish | Chrome |
| Item Dimensions (L x W x H) | 8.38 x 6.5 x 6.5 inches |
| Item Weight | 1.94 pounds |
| Number of Handles | 1 |
| Installation Method | Wall Mounted |
| Mounting Type | Wall Mount |
| Maximum Operating Pressure | 150 Bars |
| Inlet/Outlet Connection Size | 6.5 Inches |
| Inlet Connection Type | Threaded |
| Outlet Connection Type | FNPT |
| Specification Met | ADA |
5. Installation Instructions
This section provides general guidelines for installing the Moen UT2661 Shower Trim Kit. Refer to the detailed instructions provided with your M-CORE Mixing Valve (U140) for specific rough-in and valve installation steps. This trim kit is designed to be installed after the M-CORE valve body is securely in place.
5.1 Prepare the M-CORE Valve
- Ensure the M-CORE Mixing Valve (U140, sold separately) is correctly installed and secured to a brace within the wall, following its specific instructions.
- Verify that the integrated test cap is in place, allowing for flushing and pressure testing of the system.
- Once testing is complete and the system is flushed, remove the test cap.

Figure 3: Illustration of the M-CORE valve body and cartridge components.

Figure 4: M-CORE valve body with integrated test cap for flushing and testing.
5.2 Install the Cartridge
- Align the mixing valve cartridge with the valve body. The cartridge is designed to fit in a specific orientation.
- Gently push the cartridge into the valve body until it is fully seated.
- Secure the cartridge according to the valve's instructions, typically with a retaining nut or clip.

Figure 5: Inserting the M-CORE cartridge into the valve body.
5.3 Install the Trim Plate and Handle
- Position the trim plate over the installed valve and cartridge. Ensure it sits flush against the finished wall surface.
- Secure the trim plate using the provided screws. Do not overtighten.
- Install the handle assembly onto the cartridge stem.
- Secure the handle with the set screw, typically located on the underside of the handle.
- Test the handle for smooth operation and ensure the temperature limit stop is set to your desired maximum temperature.

Figure 6: Assembling the trim plate and handle onto the installed valve.
6. Operation
The Moen UT2661 Vichy M-CORE 2-Series 1-Handle Shower Trim Kit provides simple and intuitive control over water flow and temperature.
- Turning On/Off: Rotate the handle counter-clockwise to turn on the water. Continue rotating to increase flow. Rotate clockwise to turn off.
- Adjusting Temperature: The handle controls both flow and temperature. As you rotate the handle, the temperature will adjust from cold to hot. The M-CORE valve's pressure-balancing feature helps maintain a consistent temperature.
- Temperature Limit Stop: The integrated temperature limit stop prevents the handle from being rotated past a preset maximum hot water temperature, enhancing safety. This can be adjusted during installation.
7. Maintenance
Proper care and maintenance will ensure the longevity and appearance of your Moen shower trim kit.
- Cleaning: Clean the chrome finish regularly with a soft, damp cloth. For stubborn spots, use a mild soap and water solution. Rinse thoroughly and dry with a soft cloth to prevent water spots.
- Avoid Harsh Cleaners: Do not use abrasive cleaners, scouring pads, ammonia-based cleaners, or cleaners containing bleach, acids, or harsh chemicals, as these can damage the finish.
- Cartridge Replacement: If you experience issues with water flow or temperature control, the mixing valve cartridge may need to be replaced. Refer to the M-CORE valve manual or contact Moen customer support for guidance.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No water flow or low flow | Main water supply off; Clogged cartridge; Debris in pipes. | Check main water supply; Inspect and clean/replace cartridge; Flush water lines. |
| Inconsistent water temperature | Faulty cartridge; Issues with water heater; Pressure imbalance. | Replace cartridge; Check water heater settings; Ensure M-CORE valve is functioning correctly. |
| Leaking from handle or trim plate | Loose connections; Damaged O-rings or seals in cartridge; Improperly seated cartridge. | Check and tighten connections; Replace cartridge; Re-seat cartridge properly. |
| Handle is stiff or difficult to turn | Mineral buildup; Damaged cartridge. | Clean around handle base; Replace cartridge. |
If troubleshooting steps do not resolve the issue, please contact Moen Customer Support.
9. Warranty and Support
This Moen product is backed by Moen's Limited Lifetime Warranty. For specific details regarding warranty coverage, limitations, and how to make a claim, please refer to the official warranty documentation included with your product or visit the official Moen website.
For technical assistance, replacement parts, or warranty inquiries, please contact Moen Customer Support:
- Website: www.moen.com
- Phone: Refer to the Moen website for regional contact numbers.
When contacting support, please have your product model number (UT2661) and purchase information readily available.







