The Toto® Aquia® IV T20 Washlet®+ Elongated Skirted Toilet Bowl with CEFIONTECT® is designed for use with the Aquia® IV tank. The skirted design conceals the trapway, which enhances the elegant look of the toilet and adds an additional level of sophistication. Skirted design toilets also minimize the need to reach behind the bowl to clean the nooks and crannies of the exterior trapway. When paired with its tank, the Aquia® IV features Toto®'s Dynamax™ Tornado Flush®, utilizing a 360 deg cleaning power to reach every part of the bowl. This version of the Aquia® IV includes CEFIONTECT®, a layer of ceramic glaze that minimizes waste from sticking to ceramic surfaces. This feature, coupled with the Dynamax™ Tornado Flush®, 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. The Aquia® IV bowl offers Toto® T40 Washlet®+ compatibility for when you are ready to up-grade. Compatible with T40 Washlet®+ electronic bidet seat models only. The Washlet®+ toilet features a channel on the bowl surface to help conceal your Washlet®+ supply line and power cord for seamless integration. When paired with its tank, the Aquia® IV meets the standards for EPA WaterSense and California's CEC and CALGreen requirements. The Aquia® IV comes ready for install into a 12 in rough-in, but may be adapted for a 10 in or 14 in rough-in with the purchase of a separately sold adapter. Additional items needed for installation and use must be purchased separately, ST446EM or ST446UM tank, wax ring, toilet mounting bolts, water supply lines and T40 Washlet®+ or seat designed for Washlet®+ models.