Not sure of the proper name, but on my '79 my stuffing box look like a female/male pipe assembly held together with two bolts an adjustment nuts on the side. With all that I'm sure you guys know what I'm referring to. So, my question is about some of the many pics I've seen on this sight of stuffing boxes like mine. It looks as though someone cut the outside (larger) pipe in half an added a section of rubber tubing between the sections. Can someone explain what is going on. The reason is, I've got a knocking sound coming from somewhere in the shaft system. I think it is in the stuffing box; not sure. A setup like that may solve my problem.