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The most commonly used water-sampling bottle at present is the Niskin bottle,
with spring-loaded end-caps with rubber washers. These are plastic
(polyvinylchloride) bottles with stoppers at each end. The stoppers are held
together by a rubber cord or spring that pulls them together from inside the
bottle. The water-tight closures at both top and bottom, equipped with
subsampling spigot and air vent, can be remotely triggered at pre-determined
depths in the water column to collect seawater samples for discrete chemical
and biological measurements. To cock these bottles, lanyards are used to pull
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