Doug
If you can find scraps from old carriers, you will need to salvage the conduit elbows, bulkhead fittings, and end fittings. The conduit itself can be made from regular conduit of the appropriate size, but you will have to thread it to 3/4" NF if I recall, which will match the BSP they originally used on the carriers. It has been a while since I made any, so don't take my ref to the threads as gospel, but I know there was a match between one of our standard threads and their thread. Of course, your new conduit will likely be galvanized, so you will have to take the appropriate steps for painting.
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