Poison tank

The  is a quest item in Fallout 2.

Characteristics
This tank is specifically built to help you sneakily assassinate Louis Salvatore, thus earning a reserved spot in the family Mordino.

Other than that, this tank has no use whatsoever.

Location
Hidden in the basement of the Desperado casino, in a room full of blue crates and rats. There is a crowbar in the same room, hold down Shift to highlight both items and find them.

Appearances
The poison tank only appears in Fallout 2.

Bugs
While the idea was to steal Salvatore's oxygen tank and replace it with this, the script actually checks to see if you yourself are holding both tanks before deciding to kill Salvatore.