TOTO Height Wall-Hung Toilet Bowl, RP Washlet®+ RX Collection, Elongated Shape, DynaMax™ Tornado™ Flush® Flush, 0.9 to 1.28 gpf Flush Rate, 2-1/8 in Trapway, 5-1/2 x 4-1/8 in Water Surface Area, 19-3/8 in Rough-In, 2-1/8 in Trap Seal Diameter, 16-1/8 in Rim Height, Minimum Water Pressure: 8 psi Static, Wall Mounting, For Use With: WT173M, WT173MA In-Wall Tank System, Finish: Cotton, 16-1/8 in H x 15 in W, Domestic/Import: Import