Its more a listing thing rather than a code thing. NEC requires RT, but its listing that allowes it to be RT.

My understanding is that the old style compression fittings are still listed RT in Canada. Not sure if that will hold water... [Linked Image]

The new style have been slowly hitting the supply houses here, and I have a stash of them in the van right now, I like 'em. Pricey, but nice. Ya gotta be nice putting them together, if you're too aggressive you'll find that O-ring stuck in the connector during your pull. Not a fun find.

Mark Heller
"Well - I oughta....." -Jackie Gleason