It actually is PVC for plumbing. They took the time to paint it gray for what ever reason. I still am not sure what is in this building. I almost don't want to. I could take many photos in this place that just might top that photo. That place is such a disaster. One day I will have a photo of the street lighting which is made up of ceramic insulators and one hot wire that zig-zags it's way through the place....