Through the threaded exterior 14 the plug can be inserted in a tapped flange opening or {HEAD ~ other types} of {TAIL ~ tapped fitting} for introduction of packing under high pressure 
Through the threaded exterior 14 the plug can be inserted in a tapped flange opening or { HEAD ~ other types } of { TAIL ~ tapped fitting } for introduction of packing under high pressure
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 OTH OTH OTH OTH