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