[bobbecky]

Besides the possibility of the air gap/anti back flow valve being installed backwards, your leak could be coming from behind the panel of your convenience center. Early on when our rig was new, I had leaking water in the pass through, and after I removed the side panel, I found several fittings loose, so I tightened all of them and that stopped the leaking. The photo shows what we have behind our wall, and the white connection nuts are what was loose. The blue and red PEX colors are obvious for the cold and hot water lines, but they used red PEX on our tank flush, which is the bottom line in the photo, and that fitting may be loose causing the water leak. The next photo shows where our back flow valve is located between the shower and the pantry, and the last photo shows where the line connects to the flush sprayer at the front of our black tank.