Random flow vortex generator for aquarium tanks. Easily push fits on to a 17mm straight outlet (e.g. Readsea Nano). The head snaps onto the connector. The position is held at your chosen angle using friction.
The author remixed this model.
I found the connection was too loose. resized the locline side tight enough to hold the generator head position with friction. Redesigned 17mm connection with tapered easy friction fit.