The Toto® Auto Flush Kit is an easy to install upgrade for compatible WASHLET®+ T40 toilets. This model is designed to work with 1.28 gpf WASHLET®+ toilets only. When paired with the corresponding WASHLET®+ toilet and Auto Flush WASHLET®, the Auto Flush kit provides a hands-free automatic flush after every use. No need to touch buttons or handles and never worry about someone forgetting to flush.