The TOTO WASHLET+(R) Aquia IV Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet and WASHLET(R) S2 Bidet Seat is designed to conceal the WASHLET(R) power cord and water supply hose for a seamless installation. Part of the newly redesigned S series, the WASHLET S2 features a built in night light, a soft rear spray, rear cleanse, and front cleanse with the option of an oscillating stream. The temperature and pressure of the water are adjustable with three temperature settings and five pressure settings. The controls are located on a convenient arm control panel. PREMIST(R) wets the surface of the toilet bowl, aiding in the removal of waste and resulting in a better clean. The S2 model utilizes TOTO's EWATER+(R) system when the wand self-cleans. EWATER+ transforms the water into a safe and powerful compound, creating peace of mind by cleaning the inside and outside of the wand before and after every use. The WASHLET features a heated SoftClose(R) seat with three temperature settings. The Aquia IV Arc features TOTO's DYNAMAX TORNADO FLUSH(R), utilizing a 360 degree cleaning power to reach every part of the bowl. This version of the Aquia IV includes CEFIONTECT(R), a layer of ceramic glaze that minimizes waste from sticking to ceramic surfaces. This feature, coupled with the WASHLET PREMIST(R) and TORNADO FLUSH(R), assists to reduce the frequency of toilet cleanings, minimizing the usage of water, harsh chemicals, and time required for cleaning. The enhanced design of the Aquia IV inner bowl reduces water flow resistance and turbulence, resulting in a quieter flush. Allows you to proactively conserve water by choosing between a 0.9 GPF rinse or 1.28 GPF for tougher jobs. The curved tank design coupled with the skirted bowl create a sophisticated look and minimizes the need to reach behind the bowl to clean in between the nooks and crannies of the exterior trapway. Designed in TOTO's Universal Height, which allows for a more comfortable seat position across a wide range of users. The Aquia IV Arc comes ready for install into a 12" rough-in, but may be adapted for a 10" or 14" rough-in with the purchase of a separately sold adapter. Additional items needed for installation must be purchased separately: wax ring, toilet mounting bolts, and toilet water supply lines. Compatible with T40 WASHLET+ electronic bidet seat and toilet bowl components only.