Kohler K-4436-TR-95 Wellworth Classic 1.28 gpf Toilet Tank with Class Five Flushing Technology, Ice Grey Class Five flushing technology provides tremendous bulk waste flushing performance and best-in-class bowl cleanliness Canister flush valve provides smooth flushing actuation with consistent water usage, flush after flush 1.28 gpf High-efficiency toilets provide significant water savings of up to 16,500 gallons per year versus an old 3.5 gallon toilet without sacrificing performance Tank locks Right-hand trip lever