{HEAD ~ inlets} for external supplies of inert gases in {TAIL ~ the downward extending section} of the cylinder, 
{ HEAD ~ inlets } for external supplies of inert gases in { TAIL ~ the downward extending section } of the cylinder ,
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH