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