This Steam Valve is needed in the mission "No Vacancy" to restore power to the Happy Pig Motel
The Steam Valve is a mission item in Borderlands 2
It is located on top of a big rig
It is used in the mission No Vacancy to repair the power outage in the Happy Pig Motel
Happy Pig Motel, at the very top of the oil rig. Shoot ladder then climb.