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"duster" = HFC-134a = tetrafluoroethane = the correct low pressure gas; what most Japanese GBBs run on.
However, a lot of "air in a can" is actually = HFC-152a = difluoroethane = slightly lower pressure and bad for a number of seals. Don't use it.
The can will always say either tetrafluoroethane or difluoroethane somewhere on it.
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