For combination with a KESSEL technology kit for creating a Duo lifting station for wastewater without sewage with a GTF1200 wastewater pump. The ready to plug in lifting station for wastewater without sewage is equipped with a submersible pump and a backflow preventer. The collection tank made of permanently resistant polymer (PE) has an open pump tank. One-handed closures enable easy removal of the integrated components. The system for installation in the floor slab is pre-assembled for final installation on site. The station is controlled by a user-friendly control unit, which is optionally integrated in the building management system using a potential-free contact or alarm and collective fault messages that can be output through a GSM interface. KESSEL shell kit consisting of: - With vertically adjustable upper section for continuous height and level compensation and integrated floor drain - PE collection tank, resistant to aggressive wastewater and 3 m groundwater - Includes backflow preventer for the pressure pipe - Includes connection socket for inlet and conduit pipe