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