The EcoLogic Niagara flapperless toilet features tip-bucket technology and a high-performance output (1.28 gpf).Niagara’s patented WaterSense-certified flapperless technology is maintenance-free, eliminating the need to replace flappers, chains and levers. No double flushing and no leaks, plus a no-sweat tank. The 11” x 20” replacement footprint is designed to cover the existing cutout area with ease, eliminating costly flooring repairs and will fit both 10 5/8” and 12” rough-ins.