1.28 gpf (4.8 lpf);Left-hand Polished Chrome trip lever;Combines with 31588, 31589 bowl to make a complete 31621-DRY, 31641-DRY toilet;AquaPiston canister optimizes the flow out of the tank, harnessing gravity and the natural, powerful reducing cascade of water to increase the power and effectiveness of the flush;Easy-to-flush canister design requires less force to actuate than a 3" (76 mm) flapper, and has 90% less exposed seal material which resists conditions that cause wear, tear, shrinkage and swelling