Old Pipes

I started on a little project today that involved the use of the sawzall.   That is one of the great power tools of our day.  We have a drain that has been clogged since before our time in this building.  It happens to be the drain to the closest thing we have to a mop sink.  There is a p-trap on there that the plumber told me was so tight that nothing goes through it.   All you can do is cut it out and start over.