You could use this model to show how simple piston pump works or even create pressurized air for other engineering projects. 2 valves are required. Valves and seals should be printed with TPU and 1 perimeter wall is recommended, I havent checked them with hard plastic. Since original files are small, valves also recommended to be printed with 0.25 nozzle, however if entire pump is scaled-up, it should work with 0.4 nozzle. Any changes are welcomed! Also, do not hesitate to ask for original Solidworks files if needed.