The two pads are separated by {HEAD ~ a liquid barrier material} so that {TAIL ~ the insulating pad} is maintained in a dry operable condition 
The two pads are separated by { HEAD ~ a liquid barrier material } so that { TAIL ~ the insulating pad } is maintained in a dry operable condition
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH