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No problem........and there are no other valves in those lines except the dump valves. Most of those models have two gray tanks and each one has a valve. Is that the problem or do you have both of them open?
I will check, but I think this has two gray tanks and that is the problem. The one won't have a valve near the other two. Sometimes the handle can be sort of hidden behind one of the wheels and out of sight.
O.K........please get back to me with what the solution was. Thanks!