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