Leave the drain open so the level in the tank will drop. After the tank slowly drains you will need to use a high pressure cleaning tool to try and free the clog. After I drain my black tank I fill it back up with clean water and flush it again to avoid clogs. After every 4 or 5 camping trips I run a hose inside with my cleaning wand to clean it out real good. I use the cleaning wand sold at Walmart for $10 its PVC with 4 holes on one end and a on off valve on the other.
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2013 Ram 2500 4x4 pulling a 2014 Zinger ZF31bh 5ver.
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