We did a job replacing a ton of conduit on a buildings roof a couple years back. Inspector tagged us for not using the newly approved RT connectors. We ordered some and redid all the work. He then retags us saying his town only allows one manufacture of RT fittings. So we redid the work again =\

Now there are several manufactures that inspectors around here will accept, was just a fustrating learning process for us.

You can tell the difference between the fittings, the approved ones have colored plastic bushings everywhere. Also you can tell the difference when you get the price for the new ones [Linked Image]