If delivered with oxygen cylinders. Or almost every other item transported with oxygen cylinders or some gases under pressure. steel drum — UK / US noun [countable] Phrase varieties steel drum : singular steel drum plural steel drums a West Indian drum made of a big empty metallic container … http://hazmat-accessories40494.fireblogz.com/23035053/the-smart-trick-of-un-box-kit-that-nobody-is-discussing