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