Black holding tank won't drain past 2/3
After 4 days of camping we have a full holding tank. I open the black valve and hear a rush of fluids for about 1 min, then nothing. Check the tank level inside and it shows 2/3 full. After searchi...
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You have to be looking into the drain pipe with a flashlight while your wife pulls the valve handle before the other 1/3 will come out.
