Vacuum ejector / pump. 98% vacuum. Print in place.

Update: Added educational section cut model. Also 55/64"-27 M and F. According to my google search the most common freedom thread for faucet aerators. 

Fully working print in place vacuum pump / water aspirator / vacuum ejector. These use flowing water pump air or other gasses.

Connect directly to faucet. Following threads are included M22 M&F, M24 M&F bsp ½ M and ¾ M. Chose the one that fits your faucet.

-0.98 bar (98% vacuum) is achievable but performance will depend on water pressure and water temperature (colder water is better). 

I tested evacuating a 7 liter chamber and got -0.55 bar at 1 min, -0.74 bar at 2 min, -0.86 bar at 3 min, -0.92 bar at 4 min, -0.95 bar at 5 min.

You will need a rubber gasket (or use the one you have in your facet aerator). I also recommend connecting a hose to the end of the ejector as this helps with getting the Venturi-effect started and helps prevent water splash. For vacuum hose i used 6 mm ID 9 MM OD silicone tubing. You might also want to connect a checkvalve to the vacuum tubing as the vacuum effect can be disturbed by a number of different things (air in the water supply, changes in water pressure etc). If this happens water will backflow through the vacuum tubing if there is no check valve.

A water aspirator is generally slower than a regular vacuum pump, but has an advantage in that it can evacuate condensable gasses (like water vapor) without being damaged. It is therefor often used in chemistry for vacuum distillation etc. It can also be used to pump water.

I use it to pop “space popcorns”. They get about 30% larger and tastes 100% better when popped in vacuum. More crispy and less chewy.

I included pictures of 50 g of popcorn popped in with and without vacuum.

 (Only do this if you are confident in your setup and safety precautions. Hot oil and vacuum implosion could be dangerous.)