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