The externally threaded end of {HEAD ~ the plug} has a solid end with a circumferential groove adjacent to it and radial ports communicating with {TAIL ~ the axial passage way} in order that packing can be expelled through the ports and the grooves substantially 360 degrees around the plug to insure even distribution of the packing 
The externally threaded end of { HEAD ~ the plug } has a solid end with a circumferential groove adjacent to it and radial ports communicating with { TAIL ~ the axial passage way } in order that packing can be expelled through the ports and the grooves substantially 360 degrees around the plug to insure even distribution of the packing
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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