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Fix the two most common causes of a running toilet with a Fluidmaster Fill Valve and Flapper Kit. The kit includes the iconic 400A fill valve, the most popular toilet fill valve in the world. It also includes a solid frame flapper that aligns with the tank drain every time for a consistent, powerful flush. The whole kit can be installed in ten minutes or less and will get your toilet flushing like new again. This product replaces a leaky flapper & damaged fill valve.