The compli 500 has been designed specifically for the disposal of sewage from single dwellings with continued sewage water inlet and for a larger tank volume. It is also extremely easy to handle and installation requires a minimum of space. The PE-tank has accessible pipe connections and a particularly simple "pinch" type inlet flange for the connection of pipe or bend. As all units, the maintenance is extremly simple: the tank has a top mounted inspection opening and, if necessary, the pumping unit can be removed/ replaced in minutes and without disturbing the tank assembly.