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