Faceplated 833 4 Speed

I actually used a piece of 3/4” conduit for an arbor and it worked perfectly.
I have been wondering about being able to use a piece of conduit for an arbor in the past.
Just one question about the size I will need to get.
Are you using the 3/4" thin wall EMT conduit which has a .922" OD or are you using the thick wall RMC conduit which has a 1.050" OD ?