Spare part for a PondoRell 5000 garden water fountain by Pontec GmbH. It's the part that screws into the water outlet and forms the water flow. The part is upside down in the cover picture; the water would be flowing from the small tip, along the shaft and the inside rim of the hat-like top, bending outwards shaping a nice flow.
Depending on your printer settings and accuracy, you might have to sand down the four wings on the sides.
This model was printed in black PLA plastic using adaptive layer height with a focus on quality. Unfortunately I do not have any action shots but reportedly it works very well and fit with some minor sanding on the four wings. Consider printing in PETG since it's an outdoor part, though. The handle is meant to fit into the slot in the top and is optional (and missing in the pictures).
Unfortunately, FreeCAD can only generate an STL file for this model. Any step files are, for some reason, corrupt, which is why there's no step file available for download.
The author marked this model as their own original creation.