Moreover, {HEAD ~ the base} of {TAIL ~ the common wall} 26 also forms a seal at the head of the device, thus preventing mixing of two components of a composition as the components flow from passageways into the lumens of the dual duckbill valve 
of
Moreover , { HEAD ~ the base } of { TAIL ~ the common wall } 26 also forms a seal at the head of the device , thus preventing mixing of two components of a composition as the components flow from passageways into the lumens of the dual duckbill valve
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH