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Black water tank won't drain

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18 minutes ago, alaskawalker said:

The black water holding tank in my 2007 Holiday Rambler Neptune won't drain. Tried plunger, RV tank treatments, but it still eont drain. The grey water drains fine. 

Any suggestions?

I keep one of these with me to be able to spray water backwards into tank.F529B33B-409F-4B22-8D8B-C5E4E5F0C15E.thumb.jpeg.2ec6f750c34cfc51b713ae9fa11b8242.jpeg

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