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