Dual Flush (1.6 gpf, 1.1 gpf)
Dual-Flush toilets give users two flush options: Tilt the handle up for liquid waste, which uses 1.1 gallon per flush. Or push the handle down for a standard flush, which releases 1.6 gallons of water. Dual-Flush toilets meet HET criteria of averaging 1.28 gallons per flush or less (HET criteria for dual-flush toilets identifies the effective flush volume as the average of one high flush and two low flushes).