Our Dune 1-pc toilet is equipped with a siphon, bottom inlet, vertical outlet, Easy Clean glaze, a 4.8L flush, silent seat and a 305mm pit. This toilet consists of W570-5101 bowl and G008-0101 seat. The Dune II 1-pc Toilet toilet is also available with a 400mm pit (W588-1141-M1, consisting of W570-5201 bowl and G008-0101 seat). To create a harmonious bath experience, this toilet is best combined with the matching Dune II Back To Wall Bidet.