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