[Yoshihito Isogawa] almost never employs non-LEGO parts in his creations. He created an excellent centrifugal pump out of 100% LEGO. While mostly a curiosity, you can definitely get a sense of ...

But they don’t have to be — you can build your own at home, using LEGO, as [Build it with Bricks] demonstrates! The build is set up in an aquarium with a pump, which serves to simulate flow ...