This is designed as a spray nozzle for your garden hose, to make a Slip and Slide sprayer. Put some dishwashing detergent in a PET bottle and screw in, add a 2.7mm O-ring to the hose fitting, and screw in the screw to meter the amount of detergent going through. Place at the top of a sloping piece of plastic and enjoy summer !
This object was made in Tinkercad. https://www.tinkercad.com/things/4ZAMxxQK7dJ