Kohler Well worth Class Five Watersense High-Efficiency Toilet Tank With Left-Hand Trip Lever, Biscuit, 1. 28 Gpf Class Five - provides tremendous bulk waste flushing performance and best-in-class bowl cleanliness The product is manufactured in China 12" rough-in 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 3-bolt Installation - Three pre-installed tank bolts save installation time Canister flush valve provides smooth flushing actuation with consistent water usage, flush after flush