Algodoo

this is my first water pump
how to add water: make a box your size (as long as it fits the top container with the water inserted when simulation started), and then liquify it.
I compressed the inserted water.
you can use this without need to credit
v1.0.1: Made piston (pump) taller, and added more water.
v1.0.2: Made there be less water in top container because it lags.