Kohler K-3978-96 Wellworth Elongated 1.6 gpf Toilet, Biscuit Elongated, standard height-toilet bowl 12" rough-in 30" (76.2 cm) x 18" (45.7 cm) x 28-3/4" (73 cm) Class Five(R) - provides tremendous bulk waste flushing performance and best-in-class bowl cleanliness 3-bolt Installation - Three pre-installed tank bolts save installation time