The skill to create Hardened Adamantite Tube is taught by:
"wowhead" wrote:
K. Lee Smallfry
<Grand Master Engineer>
65 Zangarmarsh A H Humanoid
Lebowski
<Grand Master Engineer>
60 Hellfire Peninsula A H Humanoid
Mack Diver
<Grand Master Engineer>
65 Zangarmarsh A H Humanoid
Xyrol
<Grand Master Engineer>
65 Netherstorm A H Humanoid
Zebig
<Grand Master Engineer>
60 Hellfire Peninsula A H Humanoid