{HEAD ~ An articulated pipe assembly} connects {TAIL ~ the inner, track supported ends} of the connector pipes to the sprinkler line 
{ HEAD ~ An articulated pipe assembly } connects { TAIL ~ the inner , track supported ends } of the connector pipes to the sprinkler line
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH