The Oakbrook Collection 1.28 gpf 12 inches Rough-In Two-Piece Toilet with Side Lever features a highly efficient and effective flush. At only 1.28 gallons per flush (gpf), this high efficiency toilet (HET) exceeds all WaterSense performance requirements, while saving 20% more water over 1.6 gpf toilets. Its 1,000 grams MaP Premium score provides bowl-clearing power with every flush. A corrosion-resistant rigid flapper ensures consistent operation while the reliable Fluidmaster 400A fill valve quickly and quietly refills the tank. It includes a soft-close toilet seat with cover that closes slowly and softly to avoid slamming, while large seat bumpers prevent sliding while you sit.