American Standard Evolution 2 Right Height Elongated Toilet, white 2428.800.020 The American Standard Evolution 2 toilet is a two-piece toilet constructed of vitreous china, a type of ceramic fired at high temperature to form a non-porous body coated with a ceramic glaze which is fused to the body, and features a 2-Inch flapper flush valve. It has a 12-Inch rough-in, and comes complete with coupling components and tank trim, including a color-matched right hand trip lever. Featuring an elongated siphon action jetted bowl, with a generous 9-by-8-Inch water surface area, and it comes with two color-matched bolt caps. It has a fully glazed 2-Inch trap way and pilot valve water control. Toilet seat sold separately. About American Standard Brands. Great performance and great looks meet in our complete line of fixtures and faucets for bath and kitchen. Performance and reliability. Coordinated collections. Ingenious features. American Standard is Style that Works Better everyday.