identifying ptc converter


I just got in a 10" nonlock ptc converter and want to verify it's a 2800 rpm stall. There isn't anything stamped into it indicating as such, or even anything on the box saying the stall. only PTC10-700-27NLU S. There's also a 41018 stamped in it. Anyone have one lying around to check out or know another way to make sure it's the right one?
Great, that's the answer I was hoping for. I didn't want to install it to find out the converter was waaaaay looser than I expected.