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I experienced something similar in my
Outlaw 29H. During the PDI the dealer only showed us 2 valves that were next two each other.... one small one for the gray and a larger one for the black tank.
Our first trip out I could see the black tank was not draining when I opened its valve. Upon inspection, I found another valve right next to the black tank where the sewer pipe was connected. Opened that valve and it was like Old Faithful!
I determined the reason that hidden valve was placed there was two fold......
First, the sewer pipe connecting the black tank to the master drain connection was very low on my rig running underneath the drive shaft. It was very likely at some point I would have hit something that would tear off the pipe and create a real mess if that valve did not exist. I have since removed that sewer pipe before that could happen and now have a separate gray tank drain and black tank drain.... one in each side of the rig.
Second, if there wasn’t a valve at the black tank opening, waste would immediately begin settling in the sewer pipe. This could possibly lead to a clog depending on how the sewer plumbing is run. By opening the first valve and then the valve by the black tank, it assures there will be an immediate rush of water pushing debris through the sewer drain pipe and preventing any clogs. It’s also why it’s a good idea not to drain the black tank unless it is at least 2/3 full and leave that valve closed until you are ready to dump.
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