I replaced the gray water valve and the black water valve. The gaps were very narrow due to the one piece split tank design of my Lance RV. After nearly an hour of removing and replacing both valves, I had the correct alignment. The problem, which is probably unique to my application, is that the seals on each side of the glide vane are loose in their recess on the valve and easily come loose when the new valve is fitted. I helped my efforts a bit by smearing silicone grease on the seats to somehow hold them in place. A much better solution would be to attach them to their seats since the entire valve is usually replaced anyway.
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