{HEAD ~ A filter regulator} filters {TAIL ~ the air} entering the signal air path and regulates the pressure in the signal air path to a predetermined pressure 
{ HEAD ~ A filter regulator } filters { TAIL ~ the air } entering the signal air path and regulates the pressure in the signal air path to a predetermined pressure
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH