
Siphon
Gravity Dependent
The noun form of 'siphon' relies on gravity to work, like sucking liquid through a straw.

The mechanic needed a siphon to empty the gasoline tank.
Flow Direction
'Siphon' implies a liquid moving from a higher area to a lower one without a pump.

After the rain, we used a siphon to remove water from the cover.
Initiating Process
Starting a siphon may require suction to begin the liquid flow.

He started the siphon by sucking on the tube.
Compare with
DrainDrawExtractorMovePipettePumpTransferTubing
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