Wet-running circulation pump with threaded connection. Application - circulation systems for drinking water and related systems in industry and technical equipment of buildings. All plastic components in contact with the medium comply with KTW recommendations. Star-Z 15 TT with integrated timer and thermostat, LC display with symbols, red button technology, and automatic identification of thermal disinfection of the drinking hot water tank, with a shut-off ball valve on the suction side and a non-return valve on the discharge side.