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