Referring to FIGS 2 and 3, the lumens 18,20 share {HEAD ~ a common wall} 26, which extends entirely from the base 14 to {TAIL ~ the distal end} 28 of the dual duckbill valve 
extends entirely to
Referring to FIGS 2 and 3 , the lumens 18,20 share { HEAD ~ a common wall } 26 , which extends entirely from the base 14 to { TAIL ~ the distal end } 28 of the dual duckbill valve
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH