water aspirator

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wa·ter as·pi·ra·tor

a water-operated jet ejector pump commonly used as a laboratory suction pump.
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References in periodicals archive ?
Here's a big, big hint: your water aspirators, despite being a common way of creating low-strength vacuum for many standard laboratory applications, are known contributors to water waste and contamination.
* Standalone pumps, such as diaphragm vacuum pumps, provide an alternative to house vacuum systems and water aspirators
"Local vacuum pumps can take up to about 1/3 of the fume hood space and may require water aspirators for filtration," says Coffey.
All of the science facilities were using water aspirators for the roto evaporation procedures used to extract base organic solvents from various chemical and biological processes.