This toilet from Champion collection has an ideal height of 16 1/2 and an elongated front. Its flushing system features a 4" non-adjustable piston action Accelerator. The EverClean surface inhibits the growth of stain- and odor-causing bacteria, mold, and mildew on the surface. Easy installation. 4.8 liter per flush. Lined tank, high efficiency, 12" rough-in size, 2 3/8" trap way. 10 years warranty on porcelain.