Toto. The one-piece UltraMax II and two-piece Drake II (shown) high-efficiency toilets feature 1.28 gallons-per-flush double cyclone flushing technology. The Double Cyclone Flushing Engine combines water efficiency, performance, and bowl-cleansing for the gravity-fed toilets. When flushed, two nozzles at the back of the bowl fire high-speed jets of water into the concave rim to cleanse the surface. Simultaneously, a siphon jet creates a cyclone of water to remove waste from the bowl. Both toilets offer curvilinear design elements and are ADA-compliant, measuring 17 inches from base to seat. 888.295.8134.