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I learned was warned about and then I have a religious debate is not to have both of those gate valves open at the same time. I have seen people do that. I've heard of people doing that. The problem with that is you're going to take a chance at the least of having some black water. If you're very water ran out first, you got black water coming out and it's going to back up into it will back up some. It will come out of the tank faster likely to get up the hose due to friction loss in particular. Some of it will back up into a great tank. You do not want that in your great tank. Even though it's not backing up into your sink but you do still want it in your great tank. That's one thing that I'll leave my gray valve open on a day to day basis because I have to dump it every day. We have our own washer in the coach. We use a lot of water for co-