Rocket fuel tank.
This tank came from the third stage of a Minute Man missile and was meant to hold MMH fuel. MMH stands for monomethylhydrazine, which is mixed with dinitrogen tetroxide (N2O4) in rocket engines like this. Source:eBay seller selwrite Contributor:Theodore Gray Acquired:12 May, 2007 Text Updated:12 May, 2007 Price: $80 Size: 36" Purity: >60%