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