I've got everything off except the valve. I know to rotate the valve counterclockwise so I can pull it out, and see the male slots on the bottom of the new valve, so I assume the alignment is critical. It's probably just because I'm tired, but I don't seem to be able to line the valve up with the female slots so I can pull the valve off the cannister from underneath the vehicle. Can anyone tell me about how far to rotate the valve from its locked position, in order to pull it off? And by the way, Nissan made this job more difficult than it needed to be. Thanks.