A slidable tubular insert is carried within the principal conduit member and moves from {TAIL ~ an opened and closed position} to open or close an opening in {HEAD ~ the principal conduit member} and permit a formed article to move within 
A slidable tubular insert is carried within the principal conduit member and moves from { TAIL ~ an opened and closed position } to open or close an opening in { HEAD ~ the principal conduit member } and permit a formed article to move within
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH