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