Pressure Assist 1.6 GPF Toilet Tank Replacement System for Two-Piece Toilets, M-101526-F33, 503 Series

This 1.6‑gallon pressure‑assist tank system is engineered for reliable performance in two‑piece pressure‑assist toilets, offering powerful flushing action and consistent flow. It is designed specifically for systems originally equipped with Flushmate III 503‑series technology, ensuring compatibility and dependable operation. Built to fit to replace Gerber 28-385 tanks.

It uses pressure rather than gravity, producing a vigorous flush that meets performance expectations in both residential and commercial environments. The system includes key components such as the vessel (1.6 GPF), tank nut, and essential gaskets for tank‑to‑bowl integration—providing a complete solution for maintenance or replacement needs.

To verify the M-101526-F33 is the correct replacement system for your Flushmate system, please verify your serial number, label located on the top of your existing Flushmate unit, contains the following information.

• Fits Porcelain Brands: Gerber
• Right-hand, left-hand, push button handle location
• Maintains consistent flush volume throughout long‑term usage
• Helps reduce double flushing through high‑flow pressure‑assist operation
• Designed for use with two‑piece pressure‑assist toilet tanks for dependable operation
• Suitable for high‑demand environments such as hotels, schools, and commercial restrooms
• Pressure‑assist technology delivers stronger flushing performance compared to gravity systems
• Provides a 1.6‑gallon pressure‑assist flush system compatible with Flushmate III 503‑series toilets
• Includes all installation components: system vessel (M-101526-F33), tank‑to‑tank gasket (A-323288), shank locknut (B-103021), discharge extension locknut A-119221-1), and tank‑to‑bowl gasket (E-205288)