The Toto® EP Wall-Hung Elongated Toilet and DuoFit® in-wall 0.9 and 1.6 gpf Tank System Copper Supply line is a complete toilet system less a toilet seat. The in-wall system provides you with the opportunity to save up to 9 in of valuable floor space within your bathroom. The DuoFit® in wall tank system help makes conservation easy by providing a dual flush system with Toto®'s highly efficient DYNAMAX Tornado Flush®. The DYNAMAX Tornado Flush® has a hole-free rim design that generates a centrifugal, cyclonic rinsing action with the option of 0.9 or 1.28 gal of water. The EP bowl features a skirted design that is not only easier to clean but provides a sleek and modern aesthetic. The EP bowl is coated with Toto®'s CEFIONTECT® ceramic glaze that creates a slick surface to help prevent waste from sticking and keep the bowl cleaner for longer. The DuoFit® harness allows you to select a mounting height of 15 to 19 in. This provides the opportunity for you to establish a comfortable bowl height for a wide array of individuals. The in-wall unit can support up to 880 lb when installed properly. The kit arrives ready to be installed within a 2 x 6 in stud setting. If you require installation within a 2 x 4 in setting, you will need to additionally purchase Toto®'s 2 x 4 in PVC outlet kit (THU343). This comes with a copper supply and a 2 x 6 in polyethylene waste outlet. If you want to enhance the installation with a WASHLET® bidet seat, there is a pre-attached copper supply built into the system. You will additionally have to purchase a Toto® WASHLET® Connection Kit to complete your WASHLET® install (THU807).