The Colony 3 toilet tank only from American Standard enhances the features of the coordinating bowls, 3437A101, 3437C101 and 3437D101, sold separately. Made of vitreous China, the tank is a water-saving design that reduces water consumption by 20% without sacrificing performance.High-efficiency toilet (HET) – powerful and efficient toilet uses 1.28 gpf/4.8 lpfValue priced – affordable price and reliable performanceEasy-to-clean – made of durable vitreous ChinaPowerful flush – equipped with a 3 in flush valveWaterSense certified – uses less water while maintaining great performance