a second pressure regulator in communication with {HEAD ~ said second reservoir} for controlling {TAIL ~ pressure} supplied through said pressure supply conduit to said second reservoir 
for controlling
a second pressure regulator in communication with { HEAD ~ said second reservoir } for controlling { TAIL ~ pressure } supplied through said pressure supply conduit to said second reservoir
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH