What's the best practice and most workmanlike way to install a row of metalclad sockets, using the conduit holes in their ends to cable between them? Incoming supply is on round conduit, but there seems to be no simple, neat fitting (that's stocked somewhere too!) for making this trivial connection. So far I've used conduit nipples and four locknuts (two between, so that the faceplates still fit), but that's actually a rather expensive way of doing it, particularly as the nearest stockist who carries them is 30 miles away.
Is a pair of rubber grommets considered acceptable? Presumably bare steel isn't, even though that's what was there previously!