American Standard 4021001N.020 Cadet 3 1.6 GPF  12-Inch Rough Toilet Tank Only, White Durable and easy to clean vitreous china construction Ever Clean surface inhibits the growth of stain and odor-causing bacteria, mold and mildew on the surface Oversized 3 inch flush valve with chemical resistant flapper Flat tank cover for superior storage Toilet tank only. Fits American Standard Cadet 3 toilet bowl models 3717D001 and 3717B001. Fits American Standard Cadet 3 toilet models: 270DA001 and 270BA001