We had a 31L with a flush. The server connection was in one of the "storage bins" towards the back of the coach and the flush was in the same "storage bin" but was clear over to the right. It was not visible. I had to reach back along the wall of the bin to find it. I added an extension hose because it was quite difficult to attache a hose each time. I don't know that your flush connection is in the same spot but make sure you take a close look.
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