one way valve
thingiverse
This thing was made with Tinker cad. in addition to these parts you will need to get a rubber o ring to make the seal .
Download Model from thingiverse
With this file you will be able to print one way valve with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on one way valve.