Kohler K-4431-0 Archer 1.28 gpf Toilet Tank, White KOHLER archer high-efficiency toilet tank, white, 1.28 gpf - 115153 This is highly durable This is manufactured in china 12" (30.5 cm) rough-in Class Five - provides tremendous bulk waste flushing performance and best-in-class bowl cleanliness Exclusive Drylock plate  saves installation time and keeps floors dry 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