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