Can you put a pyrex dish inside a pressure cooker?

Yes you can. Put some cloth on the bottom of the cooker, like a kitchen towel(clean !). Put in your pyrex dish, filled with goodies and about half the water you'd normally use.

Add water on top of the covered pyrex so the cooker is about 5 cm full.

Cook as you'd normally do with a pressure cooker.

Let to cool slowly when done, do not open when hot. This is important.

Enjoy!