World record with tube union from SERTO We invented the metal-to-metal seal and dispatched it to a depth of 11 km We are the only company in the world that produces tube unions which can be mounted and dismounted radially......World record with tube union from SERTO We invented the metal-to-metal seal and dispatched it to a depth of 11 km We are the only company in the world that produces tube unions which can be mounted and dismounted radially. That is not so surprising since we were the ones to invent this tube union in 1952. We also invented the metal-to-metal seal. Our products were put to the test in a rather unusual project in 1960 when they traveled to a depth of 11000 meters with Jacques Piccard on his record-breaking dive. Good connections are important to us We’ll do anything for a good connection. For connections to our customers and partners, as well as connections between two, three or four tubes. Besides our sophisticated standard products, we also offer custom-made, special solutions. People have always formed the basis for excellence at SERTO our staff is highly motivated and extremely dedicated in performing their tasks. Whether innovative engineering services, precise and reliable product manufacturing or intelligent logistics concepts our employees always work together as a team for the best results and achievements. Management doesn’t just make the strategy, they live it as well. Strategic thinking and acting for the long term The entrepreneurial freedom of an independent company enables us to think strategically in the long term. And we actively implement this strategy so that the company, originally the Gressel company founded in 1923, can continue to grow. Our products and services are continually improved and our close customer relations make certain that innovation is also in line with market conditions. SERTO has been incorporated since 2001. With subsidiaries in Germany, France and England, as well as 60 representatives throughout Europe, we have built up an efficient and customer-oriented sales network.