I was in a different home depot this morning, and found it.
the schedule 40 is NOT the stuff to use, but directly above it (in plumbing) I found the right stuff. it costs 1/2 the price of the schedule 40, maybe $1.47. It was indeed 200 PSI PVC Pressure Pipe. So, look in the same place -- they look nearly identical -- but the wrong stuff was directly below and the right stuff was above. it would be easy to see it as the same product unless you look at the tag.