Yes, thanks for the image link, tommy1000. It is more grand than the tiny hand full of "stone age" gas fitting assembly I'm referring to but that illustrates exactly the principle and general design.
http://en.wikipedia.org/wiki/Aspirator_(pump)
Here is a typical manufacture, although by a different name. Simple, eh? 🙂
Here is a typical manufacture, although by a different name. Simple, eh? 🙂
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