This was a home made kit that I did and I no longer need or use. I have not measured exactly how much they hold but Im fairly sure each is right at 10 gallons +. I made them that large so I could de-gas using a 5 gallon bucket. Made from a very large pipe with I think 1/4 plate welded it shut on bottom. Works great. You can buy both chambers or just one. I will not ship. They are simply to large and heavy. Price is 400$ for the entire setup, and that is CHEAP! Located in Dallas Fort Worth area.
Pump it just a harbor freight pump 2.5 cfm, but it works great. I could easily maintain 28in of vac in both pots. Just took it a while to get both there at the same time, thus why I have them manifolded together so. Text 817-948-3642