was rain tight required when it was installed, remember rain tight EMT fittings was just put into the code in 2005.
also if there was a female adapter on the end of the PVC and a male EMT fitting and done before the 2005 code adoption in that location then it was possible it was a code compliant installation, the EMT would only have been required to be bonded on one end, so grounding wasn't an issue if it was at the other termination point.
now for the OP, I too am guilty of gluing smurf tubing into PVC fittings, as when this stuff first came available in our area, no one carried the fittings for it, and the local supply houses didn't know it had to have a special listed fitting (or did we) never had a problem with it, and even had one inspector tried to pull it back out, and it didn't budge, but after using smurf a few times (job specs) I started to dislike it very much, wanted to go where it wanted to go, and over all just a pain to deal with, hard to push wire through, and since it came in coils, it wanted to stay in a coil, like wrestling with an alligator, one time when I was trying to cut it with a hacksaw, as soon as it was cut through it sprung up and hit me right in the eye, that was it, I hated ever since. and I never saw any advantage using it.
Pool installers love to use this stuff, but its not allowed exposed to the sun or direct buried, but most inspectors never caught it till I started gluing them in at our IAEI meetings.
But I will say gluing it in a PVC fitting is way much stronger then the junk snap in fittings they have, as it will pop right out when your trying to maneuver it into the studs, or just pulling on it a just little between a box and a stud, one time I was trying to install wire after drywall to a run to a furnace the went into a wall up to the switch and it pushed out of the fitting, had to cut open the drywall to put it back in.
Ok enough ranting
