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No a bad Idea! I will update this post sooooon! I have been traveling a bit and havent had time to roll under the 5th wheel and remove some coroplast to peek in and see if the drain valve was covered. We ended up just pumping it all out for a quick fix. Update soon to come!

I think you are correct. vent/overflow tube. I will be searching behind the coroplast to see if the release valve never got through. Thank you

Thank you very much for the advice. I wasnt thinking about the mystery line being an overflow line. I will be sure to pull the coroplast away a bit and peek in and see if i cant see it on the drivers side. It must be tucked away or else it was never installed. Here is a photo if the line that...

Hey im having the exact same issue on my Heartland 39mb. I have crawled the thing a couple time and see nothing. There is something similar to a drain valve but its not in the place i would expect it to be and it has no valve for release. Its near the passenger side rear tire Was yours found in...