Offering the widest waterway available, the Champion 4 features a 4-inch flush valve that pushes water into the bowl up to three times faster than standard 2-inch flush valves, and 30 percent faster than a 3¼ -inch flush valve, the maker says. Also, the fully glazed 2 3/8-inch trapway is designed to move almost 70 percent more mass than a standard 2-inch trapway. Champion 4 technology is available in a two-piece toilet, as well as on the FloWise high-efficiency toilet. 800.899.2614. www.americanstandard-us.com.