The TOTO T20/T40 WASHLET+ Ready WASHLET S7A can be installed on standard elongated toilets or on TOTO T20/T40 Toilets which conceal the WASHLET bidet seat's power cord and water supply hose for a seamless installation. T20/T40 Washlet S7A Elongated Bidet Toilet Seat.Instead of traditional toilet paper that can sometimes be rough and often ineffective, the WASHLET quickly provides comfortable warm water cleansing at the touch of a button.