Features include: SmartFit tank-to-bowl connection and SmartFit installation tool. Bowl is 16-1/2" high, chair height with 1.28 GPF (gallons per flush), HET (High Efficiency Toilet). 3" flush valve, 2" fully glazed trapway, and virtually clog-free maximum flush. Scored 1000 gm (gram) on the MAP (Maximum Achievable Pressure) test.