This is a remix of the following design on Thingiverse:
The model has been upscaled to fit a 16mm diameter nozzle. In my particular use case, this fits snug on a SunSun JP-024F 317 GPH Aquarium Powerhead Water Pump with Internal Filter (Amazon link here).
May fit on other models if the pump outlet is 16mm diameter.
The author marked this model as their own original creation.