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