It is comprised of {HEAD ~ a plug body} 12 having at one end {TAIL ~ the threaded exterior} 14 and at the opposite end a hexagonal square of circular exterior 16 for the reception of a wrench or the like 
having
It is comprised of { HEAD ~ a plug body } 12 having at one end { TAIL ~ the threaded exterior } 14 and at the opposite end a hexagonal square of circular exterior 16 for the reception of a wrench or the like
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH