Pressure-Assist 1.6 GPF Toilet Tank Replacement System for One-Piece Toilets, M-102540-C, 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. 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. Flushmate systems push waste up to 33% farther than ANSI minimum standards, providing superior drain carry for high‑use environments such as hotels, commercial buildings, multifamily housing, schools, and residential settings.

• Right-hand, left-hand, push button handle location
• Maintains consistent flush volume throughout long‑term usage
• Designed for use with one‑piece pressure‑assist toilet tanks for dependable operation
• Suitable for high‑demand environments such as hotels, schools, and commercial restrooms
• Provides a 1.6‑gallon pressure‑assist flush system compatible with Flushmate III 504‑series toilets
• Includes all installation components: system vessel (M-102540-F3A), shank locknut (B-103021), brass washer (E-103021-1), brass hex nut (E104021), rubber washer (E-204288), bolt plate gasket (E-406288)
• Fits Porcelain Brands: American Standard, KooHoo, Laufen, Niagara, Orion, Peerless, St. Thomas Creations, Universal Rundle, Vitromex, Vortens/Lamosa