In Germany most of the sea outlets were built in the years 1970 - 1985. Outlets were carried out into the Northsea and Eastsea as well as into the rivers Elbe and Rhein. Since that time bauku has an extensive know-how on the static contsruction and the installation of such pipelines. A co-operation with competent building companies is important because such projects have higher demands than the usual sewer technology on land. PROFILEEN ® pipes are connected to great lengths without problems. The maximal length depends on the used pipe profile as well as from the installation method in the water. Due to the high demands on the pipe connection the extrusion welding joint is mostly used. Because of the mechanical strength it is possible to move the pipes in the water and to lay them on the sea-bottom without any danger of damages. Of course bauku has also special joints which can be made under water by divers. Only so, the connection with the buildings or several pipelines is possible. For this we use a rubber joint connection which is also arrest mechanically. As our PROFILEEN ® pipes are lighter than water the transport on the water is no problem. Either the laying onto the sea-bottom occurs by additional weights which are at the outside of the pipe, by anchoring on the sea-bottom and winches or by filling the "hollow chambers" in the profile e. g. with light concrete.    The sea outlet needs not only a good pipe as well but a complete system. The outlet buildings are an important element. The cross-section of the pipe is considerably enlarged and has to be optimize hydrodynamic optimized. Such fittings made of HDPE are produced by us and delivered to the construction site completely prefabricated.