1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your Flushmate M-101526-F3H1 1.28 GPF Complete Replacement System. This system is designed to replace or upgrade Flushmate-equipped 1.28 GPF pressure-assist toilets, offering efficient and powerful flushing performance. Please read all instructions carefully before proceeding with installation or use.
2. Safety Information
- Always turn off the water supply to the toilet before beginning any work.
- Wear appropriate personal protective equipment, such as safety glasses and gloves, during installation.
- Ensure the work area is well-lit and clear of obstructions.
- If you are unsure about any step, consult a qualified plumber.
3. Package Contents
The Flushmate M-101526-F3H1 Complete Replacement System includes:
- Flushmate M-101526-F3H1 Pressure-Assist System
- All required gaskets and seals
- Installation hardware
Note: Additional tools for installation, such as a wrench, may be required and are not included.

Image: The Flushmate M-101526-F3H1 Complete Replacement System, showing the main unit and associated components.
4. Compatibility
This Flushmate system is specifically designed for two-piece pressure-assist toilets. It is a genuine factory replacement for Flushmate Model 503H Series and Series III systems.
Identifying a Two-Piece Toilet:
A two-piece toilet has a separate tank and bowl, with a visible seam and gap between them. In contrast, a one-piece toilet has the tank and bowl molded together as a single unit.

Image: Illustration of a two-piece toilet, highlighting the separation between the tank and bowl.
Compatible OEMs:
This system is compatible with most Original Equipment Manufacturers (OEMs) including Gerber, Glacier Bay, Kohler, Mansfield, ProFlo, Seasons, and Western.
Exclusions:
This system is not intended for Kohler K4404 and Gerber 28-385 tanks. Additionally, ensure your toilet tank is at least 14 inches wide from side to side, as the Flushmate unit may be too wide for narrower tanks.
5. Setup and Installation
The Flushmate M-101526-F3H1 system is designed for quick installation by both plumbers and DIY enthusiasts. Detailed online instructions are available for specific steps. Below are general guidelines:
Pre-Installation:
- Turn off the water supply valve to the toilet.
- Flush the toilet to drain the tank completely.
- Disconnect the water supply line from the toilet tank.
- Remove the old Flushmate unit from the tank.
Installation Steps:
- Clean the inside of the toilet tank thoroughly before installing the new unit.
- Place the new Flushmate M-101526-F3H1 system into the toilet tank, ensuring all gaskets and seals are correctly seated.
- Secure the unit according to the detailed online instructions.
- Before reconnecting the water supply line to the Flushmate unit, place the end of the supply line into a two-gallon bucket. Turn on the water supply fully for a few seconds to flush out any debris or sediment from the supply line. Repeat if necessary until the water runs clear. This prevents potential damage to the new unit.
- Reconnect the water supply line to the Flushmate unit.
- Slowly turn on the main water supply to the toilet and check for leaks.
- Test the flush mechanism several times to ensure proper operation.

Image: Top view of the Flushmate M-101526-F3H1 system, showing the internal components and connections.
6. Operating Instructions
The Flushmate M-101526-F3H1 system utilizes pressure-assist technology for a powerful and efficient flush. Instead of relying on gravity, it uses compressed air to deliver a high-velocity, single flush.
- Flushing: Simply press the flush handle as you would with a standard toilet. The system will release the pressurized water, ensuring superior waste removal and a cleaner bowl.
- Quiet Operation: This system is designed for quiet operation while maintaining powerful flushing performance.
- Water Savings: The 1.28 GPF (Gallons Per Flush) system provides consistent water savings compared to older, less efficient toilet systems.
7. Maintenance
To ensure the longevity and optimal performance of your Flushmate system, follow these maintenance guidelines:
- Genuine Parts: Always use Flushmate Genuine Parts for any replacements or repairs. These parts are manufactured and tested to Flushmate specifications for reliability.
- Consistent Water Savings: The flush volume remains constant over time, ensuring long-term efficiency. Unlike gravity systems that can degrade, this design delivers reliable performance and sustained water savings.
- Cartridge Maintenance: If your system includes a removable cartridge, refer to the specific online instructions for calibration and replacement frequency.
8. Troubleshooting
If you encounter issues with your Flushmate M-101526-F3H1 system, consider the following common problems and solutions:
- Squeaking Noise: A squeaking noise, especially when the unit is shutting off, may indicate an issue with internal components. Check for debris or wear in the valve assembly.
- Slow Leak at Supply Valve: Ensure all connections are tight and that the gaskets and seals are properly seated. Inspect the supply valve for any visible damage or wear.
- Weak Flush: Verify that the water supply is fully open and that there are no obstructions in the supply line or the Flushmate unit. Ensure the unit is correctly installed and sealed.
- Water Not Filling: Check the water supply connection and ensure the shut-off valve is completely open. Inspect the fill valve within the Flushmate unit for any blockages.
For persistent issues, refer to the detailed online troubleshooting guides or contact Flushmate customer support.
9. Specifications
| Model Number | M-101526-F3H1 |
| Flush Volume | 1.28 GPF (Gallons Per Flush) |
| Compatibility | Two-piece pressure-assist toilets (excluding Kohler K4404 and Gerber 28-385 tanks) |
| Material | Plastic |
| Color | Black |
| Item Weight | 0.01 Ounces |
| Product Dimensions | 18 x 8 x 17 inches |
| Installation Type | Floor Mounted (for the toilet fixture) |
| Part Number | 93001096 |
| UPC | 064871410559 |
10. Warranty and Support
Warranty:
Flushmate systems are backed by a 5-year limited manufacturer warranty. This warranty provides reliable support and long-term peace of mind, covering defects in materials and workmanship under normal use.
Customer Support:
For technical assistance, troubleshooting, or warranty claims, please contact Flushmate customer support. Telephone support is available to assist with any questions or concerns you may have regarding your product.
Please visit the official Flushmate website for contact information and additional resources.