How do I check the black drain valve?
Even though all three valves are fully closed while towing, there is always some residue from the black tank when I remove the cap. I am guessing the black drain valve is not leak tight. Is there any way to inspect the valve? How difficult is repair/replacement? Any suggestions?
Thanks!
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2016 F281BIKS, Added Renogy DC-DC charger to better charge deep cycle batteries.
2003 F250 7.3L Powerstroke Crewcab longbed 20K lbs GCWR
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