Rigid conduit is thick tubed conduit often times made of galvanized steel; unlike emt which is thin tubed conduit. Therefore rigid fittings are heavy duty and most often used for industrial purposes.I was a commercial/Industrial Painter for 30 years. All I know is I painted over a lot of electrical wire and components in my time!
So I read back in the thread and see they are made from different Metals.? . I don’t know one from another,I figured it look like the cheap one I bought at Lowe’s.
Let us know how it holds.