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It was not intended to check whether it drains into the galley tank, that part I know based on ours and Jay_Bird's 3850FL (now with that said, maybe the Amish Craftsmen decided to do something drastic on Napria's rig, but not likely). It would show whether there is a clog in the drain which is what was asked. There is no way for the drain in the slide to direct discharge to the sewer outlet unless Keystone has done some really intricate plumbing, which I doubt. If all valves are shut and the water comes out the sewer, then it is direct plumbed, as our previous two rigs were.
Bingo
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