Floor-Mounted, Back-Outlet Toilet Combination Bowl And Tank Less Seat * Elongatedbowl ; Fully Glazed 2-1/8-Inch Trapway; 10-Inch X 12-Inch Water Surface Area * Elongated15-Inch High Bowl With Four (4) Bolt Caps And Two (2) Floor Screws. For Use With Both1.6 Gpf And 1.1 Gpf Tanks.