Vacuum ejector
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A vacuum ejector, or simply ejector, or aspirator, is a type of vacuum pump, which produces vacuum by means of the Venturi effect.
A brass aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.
Water eductor
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A water eductor or water dredge is an eductor-jet pump-based tool used by underwater archaeologists to remove sediments from an underwater archaeological site. Airlifts may be used for the same purpos
Vacuum ejector
…used in maritime operations as a device to dewater (drain) areas in a ship that have been flooded in emergency situations. Typically referred to as an eductor in these applications, this is preferred over electrical pumps due to their simplicity, compact size, and greatly mitigated risk of explosion in the…
Archaeologists preparing a water dredge on a shallow site