The pressurized air supply 28 energizes {HEAD ~ the dispenser valves} in {TAIL ~ the pump station} 13 
The pressurized air supply 28 energizes { HEAD ~ the dispenser valves } in { TAIL ~ the pump station } 13
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH