Acid vats are just like regular vats, only with acid dripping down the side. They occur frequently in dungeons.
How to Obtain
As of March 2015, this item can only be obtained from the chest of plenty located in Warehouse Hills. Although acid vats can be mined, both naturally-generated acid vats and ones that you place will go into your inventory as regular vats.
This item is purely decorative. Use it to suggest an unkempt industrial feel, or to illustrate how many alts you sent to Warehouse Hills in order to collect acid vats.