[Superannuated Peregrinator]

I went ahead and tried tightening it. It feels like there is a nut on the other side that is turning with the bolt up inside the manifold. Therefore it is not getting any tighter. It is still leaking at a pretty good rate and loud enough my old ears can hear it without aid of my leak detector. I can hear the system compensating for the leak by pulling air from the tank above the tag axles about every 15-20 seconds. It doesn't take long to deplete the air in the tanks. Any ideas are welcome.