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 circular exterior 16 for {HEAD ~ the reception} of {TAIL ~ a wrench} or the like 
of
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 circular exterior 16 for { HEAD ~ the reception } of { TAIL ~ 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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH