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