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Dean, we have a different unit, but have had issues with black tank leakage when the tank is "over" filled. We stayed at our home this past summer, and stayed in the fiver. I would fill the black tank to the highest point possible because we had to go to a state park to dump. My service manager at the dealer told me that the vent merely fits in a rubber boot. IIRC, Rich's ordeal may have proven this statement incorrect. Or, perhaps it is like everything else on these units, some are, some aren't. So, there may be hope.
Just one word of caution. Try to get the fifth wheel leaning toward the drain side and flush good. The way those tanks are designed, they're not gonna empty good sitting level. I dumped ours at the state park, then came home, parked on the side of the hill a ways from the house, and I bet it still had five gallons of crap in it. Luckily, we have several acres and the house is on the back.
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