The barrier may be made of rigid material, for example, constructed from {HEAD ~ a plurality} of sectors but is preferably made from {TAIL ~ a flexible material} so that it can be fitted around an existing conventional insulator 
The barrier may be made of rigid material , for example , constructed from { HEAD ~ a plurality } of sectors but is preferably made from { TAIL ~ a flexible material } so that it can be fitted around an existing conventional insulator
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH