filter regulator means for filtering the air entering {HEAD ~ the signal air path} and for regulating {TAIL ~ the pressure} in the signal air path to a predetermined pressure 
filter regulator means for filtering the air entering { HEAD ~ the signal air path } and for regulating { TAIL ~ the pressure } in the signal air path to a predetermined pressure
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH