3.5GAL, Water Closet, The Zurn RETROFLUSH upgrades a Zurn or Sloan diaphragm operated valve to hands free automatic operation in minutes. The Zurn Retroflush kit answers the problems of automatic flushing and no touch sanitary operation. It also addresses the issues of water conservation, ADA legislation, maintenance costs due to abuse, a safer environment for health care and food service industries, and the need for building owner to provide hygienic and odor-free restrooms.