The Champion 4-Inch Flush Valve from American Standard is designed to work with all 2-piece Champion toilets. At 4 inches, the Champion Flush Valve is the largest in the industry, propelling a vigorous rush of water inside the bowl, clearing contents in a single flush. When combined with the engineering of the highly-rated Champion toilet, you can be confident this flush valve will virtually eliminate clogs and maintenance, even with rigorous daily use.