Moreover, the base of 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 {HEAD ~ the lumens} of {TAIL ~ the dual duckbill valve} 
of
Moreover , the base of 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 { HEAD ~ the lumens } of { TAIL ~ the dual duckbill valve }
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL