The cartridge assembly is the main gate that opens and closes to deliver the water to the toilet bowl; Installing our new flush cartridge assembly set when your toilet has problem with the water running and weak flushes, is a good option for you Flush gate cartridge assembly is designed for power flush toilet replacement part, works in 1.6 GPF, 1.28, and 1.0 GPF (Gallon Per Flush) tanks, fits for 500, 501, 501A and 504 Series pressure assist tanks systems This cartridge set can help you fix your break toilet quickly. Easy operate, directly replace, more an option for household and toilets repair The C-100500-K flush cartridge set is suitable for flushmate M-101526-F, M-101526-, M-101526-, MA101526-F, M-102540-F, M-102540-, M-102540-, M-102540-, and M-102540-C pressure assist tanks Made from robust this flush gate cartridge assembly is engineered to withstand wear and tear, providing a cost-effective solution without compromising durability, Manufacturer: BULAIDAI