Description
Product Overview
This M-101526-F31 FM III 503 Pressure Assist Tank Assembly is a direct replacement for toilets using Flushmate Systems 1.6 gpf tanks. Designed with precision engineering, it features a durable black metal construction and includes an integrated cartridge to ensure consistent flushing performance. The tank measures 16.5″ x 17.3″ x 7″ and weighs 7.98 pounds, making it suitable for standard installation spaces. It is specifically engineered for 12-inch rough-in toilets and does not fit Kohler K4404 or Gerber 28-385 models.
Usage
Ideal for homeowners, contractors, and DIY enthusiasts replacing outdated toilet tanks in residential bathrooms. Perfectly suited for homes with existing Flushmate Systems 503 installations or those upgrading to a more efficient flushing mechanism. The tank’s compact design fits standard bathroom layouts without requiring major modifications. It is compatible with most 12-inch rough-in toilets but not suitable for 10-inch models.

Why Choose Us
This product offers unmatched reliability and ease of installation, backed by Suconvey’s commitment to quality. The included cartridge ensures immediate functionality without additional purchases. With a 4.7-star rating from over 17 customer reviews, it stands out as the top-rated replacement tank in its category. Its straightforward design reduces installation time to just 30-40 minutes and comes with step-by-step online guides for users who prefer visual instructions.
Key Features
- Engineered for Flushmate Systems 503, ensuring perfect compatibility and efficient flushing performance.
- Durable black metal construction resists corrosion and maintains structural integrity over time.
- Included cartridge eliminates the need to purchase additional parts during installation.
- Designed for 12-inch rough-in toilets only — not compatible with 10-inch models or specific brands like Kohler K4404.
- Comes with clear, step-by-step online installation guides and customer support available to resolve any issues promptly.
FAQ
Does this tank fit all toilet models?
No. This M-101526-F31 is specifically designed for 12-inch rough-in toilets using Flushmate Systems 503. It does not fit Kohler K4404, Gerber 28-385, or any 10-inch rough-in models.
How long does it take to install?
Installation typically takes between 30 and 40 minutes. The product includes step-by-step instructions and video guides available online for easy setup.
What materials is the tank made of?
The tank is constructed from durable black metal, ensuring long-term performance and resistance to wear and tear in bathroom environments.
Is customer support available if something goes wrong?
Yes. Suconvey offers prompt customer service to resolve any issues with the replacement part until you are fully satisfied.
Can I install this myself without professional help?
Absolutely. The product is designed for DIY installation and includes clear instructions and video guides to assist users through each step of the process.




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