Overview
The Flushmate M-101526-F31 is a complete replacement system designed for two-piece pressure-assist toilets with a 1.6 Gallons Per Flush (GPF) rating. This system is optimized for peak performance and compatibility, offering powerful flushing while reducing water usage compared to older, higher GPF systems. It is intended for all Original Equipment Manufacturers (OEMs) except Kohler K4404, Gerber 28-385, and -F3B- serial numbers.

The Flushmate M-101526-F31 Complete Replacement System, designed for two-piece pressure-assist toilets.
Setup and Installation
This replacement system is designed for straightforward installation in compatible two-piece pressure-assist toilets. It provides a complete unit, simplifying the replacement process.
Compatibility Check
Before installation, verify that your toilet is a two-piece fixture. A two-piece toilet is identifiable by a visible seam and a gap between the tank and the bowl, unlike one-piece toilets where these components are molded together.

Ensure your toilet is a two-piece fixture. A two-piece toilet has a visible seam and gap between the tank and bowl, unlike one-piece models where they are molded together.
Installation Process
- Preparation: Turn off the water supply to the toilet and flush the system to drain the tank.
- Removal of Old Unit: Carefully remove the existing Flushmate unit from the toilet tank. Clean the tank thoroughly.
- New Unit Installation: Install the new M-101526-F31 system. The unit comes with necessary components, though a special wrench and flush handle parts may need to be reused from the previous system or acquired separately.
- Supply Line Flush: Before connecting the water supply to the new unit, place the supply line into a two-gallon bucket and turn on the water full blast. This flushes out any debris from the supply line that could potentially damage the new system. Repeat if necessary until water runs clear.
- Final Connection: Connect the water supply to the new Flushmate unit and ensure all connections are secure and leak-free.

Key components of the Flushmate M-101526-F31 system, including the pressure vessel, flush valve, and connecting hose.
Installation Video
Official video demonstrating the Flushmate M-101526-F31 pressure assist tank, showing its features and operation. This video provides a visual guide to the system's components and functionality.
Operating Instructions
The Flushmate M-101526-F31 system operates by utilizing pressure-assisted technology to deliver a powerful and efficient flush.
- Powerful Flush: The system delivers a high-velocity water flow that effectively scrubs the bowl clean, reducing residue and streaking.
- Water Efficiency: Designed for 1.6 GPF, it ensures consistent water savings over time, minimizing the need for double flushing.
- Quiet Operation: The system is engineered to operate quietly while maintaining powerful performance.
Maintenance
To ensure the longevity and optimal performance of your Flushmate system, regular maintenance is recommended.
- Genuine Parts: For best performance and to maintain warranty, use only Flushmate Genuine Parts for any replacements or repairs.
- Cleaning: The one-piece design allows for easy removal and cleaning of the unit if needed. This also facilitates access to the tank for cleaning.
- Avoid Harsh Chemicals: Do not use chemical disinfectants or corrosive household cleaners inside the toilet tank, as this may damage the system and void the warranty.

The specialized wrench provided for easier installation and maintenance of the Flushmate system.
Troubleshooting
If you encounter issues with your Flushmate M-101526-F31 system, consider the following:
- Leaks: If a leak occurs, first check the supply line connections. Ensure the unit is properly seated and all seals are intact. Sometimes, the tank itself may be leaking, not the Flushmate unit.
- Weak Flush: A weak flush might indicate low water pressure or a blockage in the system. Ensure the water supply valve is fully open.
- Noise: While designed for quiet operation, unusual noises might suggest a component issue. Refer to the user manual for specific diagnostic steps.
- Compatibility Issues: Ensure the unit is compatible with your toilet's dimensions. Some tanks may be too narrow (e.g., less than 14 inches side-to-side) for the Flushmate system.
For complex issues, it is recommended to contact Flushmate customer support or a qualified plumber.
Specifications
| Feature | Detail |
|---|---|
| Manufacturer | Flushmate |
| Part Number | M-101526-F31 |
| Item Weight | 7 pounds |
| Product Dimensions | 16 x 14 x 8 inches |
| Item Model Number | M-101526-F31 |
| Size | 1.6 GPF |
| Color | Black |
| Style | M-101526-F31 |
| Material | Brass, Plastic, Rubber |
| Special Features | Easy to Install |
| Included Components | M-101526-F31 Complete Replacement System |
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 and service.
Support and Contact Information
For questions, technical assistance, or warranty claims, please contact Flushmate customer support:
- Phone: 800.533.3450
- Website: flushmate.com
Detailed user manuals and additional resources are available on the official Flushmate website.





