SLOAN Flush mate pressure-assist technology offers the only true high-performance, low consumption alternative to meet consumer expectations. This is why there are manufactures who offer a toilet with Sloan Flush mate parts inside the tank. To help maintains the high performance of your toilet, Flush mate offers their C-100500-K, Cartridge Kit for Flush mate III - 503 Series, 1.6 GPF. The Flush mate flush valve cartridge assembly is located in the center of the Flush mate system and accessed from the top of the Flush mate system. This is one of the few moving parts and needs to be maintained for optimum performance. The cartridge assembly is the main valve that opens and closes to deliver the water to the toilet bowl. The Flush mate C-100500-KIT is specially designed to replace your existing Flush mate flush valve Cartridges for both 1.6GPF and 1.0 GPF Flush mate Series system. Material: Plastic.