The hollow is adapted to receive the cap and connection sections and {HEAD ~ an opening} is provided in {TAIL ~ the cover} 
is provided in
The hollow is adapted to receive the cap and connection sections and { HEAD ~ an opening } is provided in { TAIL ~ the cover }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL