A printable model for a small impeller for a radial pump - the impeller has a diameter of 50mm and has a fitting for 12mm maget at the bottom so it canbe powered by two magnets - this let's you power the impeller through an air or water tight wall without needing holes fittings or electronics inside, you can simply attach one magnet to the tip of a motor and the other to this impeller and drive it through a wall