Thoughts on this? For tank use only, divert 3 way valve as normal vent. To fill and drain the bag after the tank starts to spill out, divert the valve to the bag and open the air release plug. Once bag is empty divert back to normal vent line. Would eliminate the need to put corks in the vent line.
https://www.usplastic.com/catalog/it...0666&catid=438
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