Here, {HEAD ~ such locking elements} are {TAIL ~ struts} coupled to the body of the tube to be movable between radially inner positions at which they will pass through such hole and radially outer positions at which they cooperate with the flange means to secure the tube to such wall as described above 
are
Here , { HEAD ~ such locking elements } are { TAIL ~ struts } coupled to the body of the tube to be movable between radially inner positions at which they will pass through such hole and radially outer positions at which they cooperate with the flange means to secure the tube to such wall as described above
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH