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