Yeah, but there really is only one valve. Two tanks, two drain pipes that join into one, and then a valve. I bought a new valve because I had to make a cut into the 3" black water tank sewer line in order to remove the grey water tank (well, I had to make a cut somewhere because all the pipes and tanks are glued together w/ no easy way to dissect them). When I'm done repairing the grey water tank, I plan to put a valve where I made that first cut in the sewer line.