Went on an Easter egg hunt today for the vacuum break valve. The line crosses 2/3 of the distance across the ceiling of the zoo and up with the shower supply lines and back down and joined a flexable hose to the black tank. If it had leaked it would not be good, as it was more or less above the converter.
Cut the pex pipes and was able to swing the tank end around on the flexable hose and rejoined them with flair it coupler.
http://www.acehardware.com/product/index.jsp?productId=1274464
But guess what I also found? Camoplast bowed up along the back edge of the step up below the upper tank. Chris