a valve seating portion having a valve opening therein, said valve opening permitting serum or plasma to flow into said tubular member when {HEAD ~ the separator tube} is plunged into {TAIL ~ the collection tube}, 
is plunged into
a valve seating portion having a valve opening therein , said valve opening permitting serum or plasma to flow into said tubular member when { HEAD ~ the separator tube } is plunged into { TAIL ~ the collection tube } ,
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 HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH