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