Aspirator pumps use the Venturi effect to create a vacuum. These devices are cheap because there are no moving parts. We looked it up and the one he is using costs ten US dollars on fleabay.

Sous vide: If you own an immersion circulator, a vacuum sealer is nearly a necessity. While it’s possible to utilize ...

Builds like these are much more than the sum of their parts, especially when they result in a useful tool, like this DIY vacuum chamber ... to plumb the chamber, pretty much any cheap fittings ...