Sorry for my bad english, anyway pump can't fill buckets, but still working with cells.
[1.106] Pump isn't fill buckets.
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I don't think they are meant to fill buckets
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I don't think they are meant to fill buckets
This, Pumps usually rocket launch the cells they fill so having a bucket in there would make a mess... (Also the less funny explanation is that buckets don't stack like cells so you might as well fill the bucket manually)