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Hi. First post so please re-direct me if this belongs elsewhere. I searched but didn't see a pertinent thread. We have a Legacy Elite II, and opted for the Nature's Head composting toilet That means we are not using the black tank, so want to re-purpose it as an auxiliary gray tank. Has anyone added a slide valve (like a Valterra blade valve) at the outlet in the bumper, then pulled both gray and black valves to let the water equalize between the two tanks? If so, are there any gotchas or tips that you would like to relay? We'll be very careful not to overfill the black tank, but if it did overfill, would the first exit point be the roof vent? In other words, did OTT completely seal off the pipe where the standard toilet would normally connect to the black tank? They covered it so that I can't see what's under there easily. Or, is there somewhere else water would escape that I'm not thinking of? Many thanks Matt