{TAIL ~ A nonmetallic resilient sleeve} surrounds the bolt between the flanges and a nonmetallic cover overlies at least the outer surface of {HEAD ~ the outer flange} 
{ TAIL ~ A nonmetallic resilient sleeve } surrounds the bolt between the flanges and a nonmetallic cover overlies at least the outer surface of { HEAD ~ the outer flange }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD