{HEAD ~ an outer tube} having first and second ends and {TAIL ~ a lateral inlet} near said first end, 
having
{ HEAD ~ an outer tube } having first and second ends and { TAIL ~ a lateral inlet } near said first end ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH