If anyone has any suggestions / possible solutions to undo / remove the nut pictured below they will be gratefully received.
I want to fit a duplex kit but I have yet to get the damn thing to budge because it is so tight........
It is at present soaking in plusgas, however I not sure that will be the solution in this case, as it isn't rusted in place.
Also could you confirm the correct direction to undo this nut, red or blue arrow (I don't want to find I'm tightening it into the bargain!

As always thanks for any help given.
Best wishes,
Mike.