An Icky Job
Just completed repairing the black water flush system in the tank in my 2008 Classic 31 ft. Not for the faint of smell. First completely empty the tank, then put one of the trailer wheels on a solid block at least 12 inches high. You must have the trailer secured in this position. I left the truck attached with the brake set as an added precaution.
You will need to obtain copper rings, cutter, small amount of tubing and crimping tool.
Now completely remove the belly pan.
You will see the valve near the drain, it has 3 screws that must be removed and then peel off the valve, as this is the silicone that seals it.
I cut the pipe and removed the sprayer as it was easier to work on. After the valve is removed unthread it from the pipe and then you must dig out the "you know what." Clean thorouhly and then reinstall in reverse order of removal.
Check for leaks and reinstall belly pan.
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