Exact Fit for Flushmate Systems:Directly replaces model C-100500-K and M-101526-F3/F4. Perfectly compatible with Flushmate 500, 501, 501A, 501B, 503, and 504 Series pressure assist tanks. A guaranteed fit for your power flush toilet. Fixes Common Flush Problems:Stop toilet troubles now! This cartridge solves weak flushing, constant running water, tank leaks, and water in the filter. Restore your toilet's powerful performance instantly. 5-Minute Installation, No Tools Needed:Replace your cartridge in minutes, not hours. Simply turn the old one out (counter-clockwise) and screw the new one in (clockwise). No special skills or tools required. Durable, Upgraded Material:Built to last from high-quality ABS materials that resist heat and wear. Manufactured to exceed OEM standards for a longer, more reliable service life. Complete Repair Kit Included:Get everything you need in one box: Cartridge Assembly, Duckbill Valve, and Filter Screen. A cost-effective, all-in-one solution for a full repair. Color Black Brand Name VARMHUS Item Weight 0.34 Kilograms Manufacturer Varmhus Model Number Flushmate Replacement Cartridge Included Components Flushmate Replacement Cartridge Manufacturer Part Number Flushmate Replacement Cartridge