A benefit to the use of {TAIL ~ either manifold} 401 or 401′ is an increase in allowed tolerances during assembly of {HEAD ~ the unit} 
A benefit to the use of { TAIL ~ either manifold } 401 or 401′ is an increase in allowed tolerances during assembly of { HEAD ~ the unit }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD