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Deleted member 9648
Take it back. Get a length or two of conduit, a coupler, 2x stop end boxes, 4x M4 screws, 2x lids, 2x gaskets, saddles and a pot of cement/glue and do the job properly. SWA has got to be one of the roughest ways to carry out this job and your more than likely end up with two unnecessary joints that you wouldn't have if you used another method like the one I've mentioned.
Cant see any reason why SWA would be 'rough'. If the joints are done properly and are internal then I cant see any reason why conduit would be preferable.