Sloan Flushmate C-100500 Flushmate CartridgeSloan FLUSHMATE pressure-assist technology offers the only true high-performance, low consumption alternative to meet consumer expectations. This is why every leading toilet manufacturer offers a toilet with Sloan FLUSHMATE inside. It"s also why you"ll find FLUSHMATE inside low consumption toilets in virtually every market, from hotels to schools to commercial buildings and in your home.Sloan Flushmate C-100500 Flushmate Cartridge Features: For Use With 500 501 501A 501B 503 And 504 Series Flushmate System Includes Flush Cartridge Assemble With Actuator Set Screw And Instructions