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