Photos were kindly provided by aquatuning.de shop that sells LC components as well as modding goods
P.S. In spite of Eheim pump’s wide popularity, I couldn’t find more information about these pumps on the official site or by using Google search engine. That is why I consider this article being not finished. I’ll try to add some more info to the article.
I also managed to find video recording of Eheim pump work. If you are worried about keeping it silent then it is all for you: