Coilfang Reservoir: The Steamvault » Zones » WoW Armory Light

The Steamvault (also known as the Steam Vaults) is the level 70 wing of the Coilfang Reservoir. No key is required to enter. You must defeat the first and second bosses and operate the control panels behind them in order to enter the room with the final boss. 

All mobs give Reputation to Cenarion Expedition through Exalted. To enter the instance in Heroic mode you require to be Honored with Cenarion Expedition and to possess the Reservoir Key.