The plug is comprised of an externally threaded end insertable in the opening and an axial passage way leading to an opposite end of the plug which has a threaded opening adapted to receive a nozzle of the packing gun or the like for {HEAD ~ introduction} of {TAIL ~ the packing} 
of
The plug is comprised of an externally threaded end insertable in the opening and an axial passage way leading to an opposite end of the plug which has a threaded opening adapted to receive a nozzle of the packing gun or the like for { HEAD ~ introduction } of { TAIL ~ the packing }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL