AirLift
thingiverse
I made a custom 9mm inside/13 mm outside tube to fit my standard airpump tube, specifically for my desk aquaponics setup (https://www.thingiverse.com/thing:2004453), which is an amazing design by the way! I'll post some photos once it's complete.
Download Model from thingiverse
With this file you will be able to print AirLift 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 AirLift.