Pressure‑Assist 1.0 GPF Toilet Tank Replacement System for Two-Piece Kohler K4484, M-101526-F43, 504 Series

This 1.0 gpf pressure‑assist replacement system is engineered for Kohler K4484 two‑piece toilets originally equipped with the Flushmate M‑101526‑F4, 504 Series. Using compressed air within a sealed vessel, the system delivers a powerful, high‑efficiency flush while reducing water use by up to 53% compared to traditional gravity systems. The integrated pressure‑assist technology delivers a peak flow of 70 gallons per minute, ensuring strong bowl evacuation and minimizing the need for double-flushing. Flushmate systems also 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.

This replacement package includes the complete Flushmate 504 Series system along with all required gaskets and locknuts for installation, making it a fast and straightforward way to restore proper flushing performance. The system also reduces tank sweating by containing water entirely within the vessel, helping keep surrounding restroom surfaces dry and safe. Designed for long‑term reliability, the enhanced vessel structure maintains the same footprint as earlier models while improving waste extraction—removing up to 25% more waste than previous Flushmate units.

To verify that M-101526-F43 is the correct replacement system for your Flushmate system, please verify that the serial number on the label located on the top of your existing Flushmate unit contains the following information:

• Right-hand, left-hand, push-button handle location
• Provides up to 33% longer drain carry than ANSI requirements
• Reduces odor by creating a larger water surface area in the bowl
• Extracts up to 25% more waste compared to earlier Flushmate models
• Suitable for commercial, hospitality, school, and residential installations
• Produces up to 70 gpm peak flow for powerful, single‑flush bowl clearing
• Operates at 1.0 gpf and 1.1 gpf for high‑efficiency flushing and water savings
• Replacement system installs easily in existing pressure‑assist toilet configurations
• Helps eliminate tank sweating by keeping water contained inside the pressure vessel
• Designed specifically for Kohler K4484 two‑piece toilets using the 504 Series Flushmate system
• Includes all installation components: system vessel (M-101526-F43), tank‑to‑tank gasket (A-323288), shank locknut (B-103021), discharge extension locknut (A-119221-1), tank‑to‑bowl gasket (E-205288), and a lower supply locknut