More preferably, the air pressure is regulated at {HEAD ~ about 90 psi} at {TAIL ~ the service station} 14 to operate the dispenser system 
More preferably , the air pressure is regulated at { HEAD ~ about 90 psi } at { TAIL ~ the service station } 14 to operate the dispenser system
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH