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