The device 1 further comprising a pair of {TAIL ~ end caps} adapted for sealing opposing ends of {HEAD ~ said device} 
The device 1 further comprising a pair of { TAIL ~ end caps } adapted for sealing opposing ends of { HEAD ~ said device }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD