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.Durable and easy to clean vitreous China constructionGreat flush performance with 3 in flush valveUltra-low consumption uses 1.28 gpf/4.8 lpf 20% less water than a regular toilet without sacrificing performance