The FlushAll™ will improve flushing power by as much as 40 percent! Create new toilet performance for your existing toilet. The funneling action accelerates water flow and increases flushing power. The FlushAll™ will also improve flush power while reducing water usage! The patented design will easily install in most standard toilet tanks. Includes a flush valve, gasket and tank to bowl bolts(K835-9 & K835-9BX only), the no cut overflow tube adjusts from 8.5 to 13 in.