Intermediate tube 216 is essentially {HEAD ~ a larger version} of {TAIL ~ inner tube} 214 and includes rigid proximal and distal regions 262, 264 that are integrally connected by flexible region 228 
of
Intermediate tube 216 is essentially { HEAD ~ a larger version } of { TAIL ~ inner tube } 214 and includes rigid proximal and distal regions 262 , 264 that are integrally connected by flexible region 228
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH