[sptddog]

I have this on my fusion 342, though it's not generally 2 gallons, and it's always gray water. I presume that it's my secondary grey tank. My dealer said the valves were fine - that it's the water that still lays in the long run of pipes from the gray tank to the empty. That when the trailer is level and emptied, that some water always lays in the pipes (or maybe I don't wait long enough for it to fully drain). I've explored two options...one is the type of end cap that has a hose attachment - where I can put an old piece of garden hose on it, put it over the sewer and let it fully train before removing the endcap. The other is what I generally do - I put a bucket under it before I remove the end cap - water drains in bucket, I dump bucket in sewer drain. It's annoying, but as long as it's not black water, I can live with it.