The TOTO Auto Flush Kit is an easy to install updgrade 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. Provides a hands-free automatic flush after every use. Helps increase sanitation and enhances overall hygiene. Features Easy to use and convenient designs Durable and reliable constructionSpecifications Flow Rate: 1.28 GPF Weight: 1.1 lbs - SKU: TSTM8139