A Water Tank is a Cargo item used by the Oxygen Garden to fill a station with oxygen and/or refill either an Oxygen Tank or a Carbon Dioxide Scrubber in the other slot of the Oxygen Garden.

It is pre-loaded into one of the two Cargo slots of an Oxygen Garden and two slots in the Stand-Alone Laboratory. It can be the only Cargo item that is needed to be replaced if at least one Oxygen Garden is present.

It has no known uses other than to be used in an Oxygen Garden to produce breathable atmosphere aboard space stations.

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