In all disclosed embodiments of the tube, such struts are integral with the tube body and project into {HEAD ~ apertures} formed therein as {TAIL ~ extensions} of such body 
formed as
In all disclosed embodiments of the tube , such struts are integral with the tube body and project into { HEAD ~ apertures } formed therein as { TAIL ~ extensions } of such body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH